netdev - Re: [RFC PATCH v1 2/3] net: add VEPA, VEB bridge mode

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Message-ID: <OF0D72A103.6F322B98-ON65257A13.00500E50-65257A13.005272D6@in.ibm.com>
Date:	Mon, 4 Jun 2012 20:29:57 +0530
From:	Krishna Kumar2 <krkumar2@...ibm.com>
To:	John Fastabend <john.r.fastabend@...el.com>
Cc:	bhutchings@...arflare.com, buytenh@...tstofly.org,
	eilong@...adcom.com, eric.w.multanen@...el.com,
	gregory.v.rose@...el.com, hadi@...erus.ca,
	jeffrey.t.kirsher@...el.com, mst@...hat.com,
	netdev@...r.kernel.org, shemminger@...tta.com, sri@...ibm.com
Subject: Re: [RFC PATCH v1 2/3] net: add VEPA, VEB bridge mode

John Fastabend <john.r.fastabend@...el.com> wrote on 05/30/2012 08:37:06
AM:

Some comments below:

> +static int rtnl_bridge_notify(struct net_device *dev, u16 flags)
> +{
> ...
> +		 if (!flags && master && master->netdev_ops->
ndo_bridge_getlink)
> +		 		 err = master->netdev_ops->ndo_bridge_getlink(skb,
0, 0, dev);
> +		 else if (dev->netdev_ops->ndo_bridge_getlink)
> +		 		 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0,
0, dev);

I think you should do something like:

        if ((flags == BRIDGE_FLAGS_MASTER) && ...)
                ...

Also you could use BRIDGE_FLAGS_MASTER=1, SELF=2, and use
"if (flags & BRIDGE_FLAGS_MASTER)" for consistency?


+		 if (!err)
+		 		 err = rtnl_bridge_notify(dev, flags);

It is possible to return a reporting error even though
the operation succeeded. Maybe something that could be
done here to indicate that the operation succeeded, or
is that a TODO?

>  static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr
*nlh,
>                  void *arg)
>  {
..
> +   if (!flags && dev->master &&
> +       dev->master->netdev_ops->ndo_bridge_setlink)
> +      err = dev->master->netdev_ops->ndo_bridge_setlink(dev, nlh);
> +   else if ((flags & BRIDGE_FLAGS_SELF) &&
> +         dev->netdev_ops->ndo_bridge_setlink)

Same usage of MASTER here.

Thanks,
- KK

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