netdev - Re: [PATCH net-next 0/4] switchdev: push bridge attributes down

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Message-ID: <20150924140525.514eac85@urahara>
Date:	Thu, 24 Sep 2015 14:05:25 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	sfeldma@...il.com
Cc:	netdev@...r.kernel.org, jiri@...nulli.us,
	siva.mannem.lnx@...il.com, pjonnala@...adcom.com,
	roopa@...ulusnetworks.com, andrew@...n.ch, f.fainelli@...il.com,
	vivien.didelot@...oirfairelinux.com
Subject: Re: [PATCH net-next 0/4] switchdev: push bridge attributes down

On Thu, 24 Sep 2015 13:59:26 -0700
sfeldma@...il.com wrote:

> From: Scott Feldman <sfeldma@...il.com>
> 
> Push bridge-level attributes down to switchdev drivers.  This patchset
> adds the infrastructure and then pushes, as an example, ageing_time attribute
> down from bridge to switchdev (rocker) driver.  Add some range-checking
> for ageing_time.
> 
> # ip link set dev br0 type bridge ageing_time 1000
> 
> # ip link set dev br0 type bridge ageing_time 999
> RTNETLINK answers: Numerical result out of range
> 
> Up until now, switchdev attrs where port-level attrs, so the netdev used in
> switchdev_attr_set() would be a switch port or bond of switch ports.  With
> bridge-level attrs, the netdev passed to switchdev_attr_set() is the bridge
> netdev.  The same recusive algo is used to visit the leaves of the stacked
> drivers to set the attr, it's just in this case we start one layer higher in
> the stack.  One note is not all ports in the bridge may support setting a
> bridge-level attribute, so rather than failing the entire set, we'll skip over
> those ports returning -EOPNOTSUPP.


Rather than having more in bridge, shouldn't this just be a netlink event?
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