netdev - Re: [Qemu-devel] [RFC PATCH 1/2] net: Add multiqueue support

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Date:	Fri, 29 Apr 2011 15:07:59 -0500
From:	Anthony Liguori <anthony@...emonkey.ws>
To:	Jason Wang <jasowang@...hat.com>
CC:	krkumar2@...ibm.com, kvm@...r.kernel.org, mst@...hat.com,
	netdev@...r.kernel.org, rusty@...tcorp.com.au,
	qemu-devel@...gnu.org
Subject: Re: [Qemu-devel] [RFC PATCH 1/2] net: Add multiqueue support

On 04/20/2011 03:33 AM, Jason Wang wrote:
> This patch adds the multiqueues support for emulated nics. Each VLANClientState
> pairs are now abstract as a queue instead of a nic, and multiple VLANClientState
> pointers were stored in the NICState and treated as the multiple queues of a
> single nic. The netdev options of qdev were now expanded to accept more than one
> netdev ids. A queue_index were also introduced to let the emulated nics know
> which queue the packet were came from or sent out. Virtio-net would be the first
> user.
>
> The legacy single queue nics can still run happily without modification as the
> the compatibility were kept.
>
> Signed-off-by: Jason Wang<jasowang@...hat.com>
> ---
>   hw/qdev-properties.c |   37 ++++++++++++++++++++++++++++++-------
>   hw/qdev.h            |    3 ++-
>   net.c                |   34 ++++++++++++++++++++++++++--------
>   net.h                |   15 +++++++++++----
>   4 files changed, 69 insertions(+), 20 deletions(-)
>
> diff --git a/hw/qdev-properties.c b/hw/qdev-properties.c
> index 1088a26..dd371e1 100644
> --- a/hw/qdev-properties.c
> +++ b/hw/qdev-properties.c
> @@ -384,14 +384,37 @@ PropertyInfo qdev_prop_chr = {
>
>   static int parse_netdev(DeviceState *dev, Property *prop, const char *str)
>   {
> -    VLANClientState **ptr = qdev_get_prop_ptr(dev, prop);
> +    VLANClientState ***nc = qdev_get_prop_ptr(dev, prop);
> +    const char *ptr = str;
> +    int i = 0;
> +    size_t len = strlen(str);
> +    *nc = qemu_malloc(MAX_QUEUE_NUM * sizeof(VLANClientState *));
> +
> +    while (i<  MAX_QUEUE_NUM&&  ptr<  str + len) {
> +        char *name = NULL;
> +        char *this = strchr(ptr, '#');

However this is being used is not going to be right.  Is this taking 
netdev=a#b#c#d?

I sort of agree with Michael about using multiple netdevs for this but I 
don't yet understand how this gets sets up from userspace.

Can you give an example of usage that involves the full tap device setup?

Ideally, a user/management tool would never need to know about any of this.

In a perfect world, we could just dup() the tap fd a few times to create 
multiple queues.

Regards,

Anthony Liguori
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