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

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Message-ID: <CAE4R7bATAj3JtinF7BjFhR26ViC39BB9AjBEJ7h=4LW0XMyn9A@mail.gmail.com>
Date:	Thu, 24 Sep 2015 20:25:01 -0700
From:	Scott Feldman <sfeldma@...il.com>
To:	Stephen Hemminger <stephen@...workplumber.org>
Cc:	Netdev <netdev@...r.kernel.org>,
	Jiří Pírko <jiri@...nulli.us>,
	Siva Mannem <siva.mannem.lnx@...il.com>,
	Premkumar Jonnala <pjonnala@...adcom.com>,
	Roopa Prabhu <roopa@...ulusnetworks.com>,
	"andrew@...n.ch" <andrew@...n.ch>,
	Florian Fainelli <f.fainelli@...il.com>,
	Vivien Didelot <vivien.didelot@...oirfairelinux.com>
Subject: Re: [PATCH net-next 0/4] switchdev: push bridge attributes down

On Thu, Sep 24, 2015 at 2:05 PM, Stephen Hemminger
<stephen@...workplumber.org> wrote:
> 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?

You lost me?  Oh, do you mean netdev notifier?  Jiri (privately) had
suggested that also.
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