netdev - Re: [patch net-next v4 14/21] bridge: add brport flags to dflt bridge

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Message-ID: <CAE4R7bBqAg0CoEcz0s6MKnCH60YEk3EMDD875H_p4GtRhGMGUQ@mail.gmail.com>
Date:	Thu, 27 Nov 2014 10:46:23 -1000
From:	Scott Feldman <sfeldma@...il.com>
To:	Jamal Hadi Salim <jhs@...atatu.com>
Cc:	Jiri Pirko <jiri@...nulli.us>, Netdev <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	"nhorman@...driver.com" <nhorman@...driver.com>,
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	Andy Gospodarek <gospo@...ulusnetworks.com>,
	Benjamin LaHaise <bcrl@...ck.org>,
	Hemal Shah <hemal@...adcom.com>
Subject: Re: [patch net-next v4 14/21] bridge: add brport flags to dflt bridge_getlink

On Thu, Nov 27, 2014 at 3:17 AM, Jamal Hadi Salim <jhs@...atatu.com> wrote:
> On 11/27/14 05:40, Jiri Pirko wrote:
>>
>> From: Scott Feldman <sfeldma@...il.com>
>>
>> To allow brport device to return current brport flags set on port.  Add
>> returned flags to nested IFLA_PROTINFO netlink msg built in dflt getlink.
>> With this change, netlink msg returned for bridge_getlink contains the
>> port's
>> offloaded flag settings (the port's SELF settings).
>
>
> Am i missing something or we already have this stuff showing up in user
> space today?

For RTM_GETLINK, rtnl_bridge_getlink() calls ndo_bridge_getlink twice
for each dev, once on bridge and second time on dev.  Each call adds
an RTM_NEWLINK to skb.  For the ndo_bridge_getlink() call to bridge,
the MASTER port flags are filled in using br_port_fill_attr().  For
the second ndo_bridge_getlink() call to dev, the port driver calls
ndo_dflt_bridge_getlink() which fills in the SELF port flags.  Before
this patch, ndo_dflt_bridge_getlink() was only filling in hwmode.

Whew, in any case, I think you'll agree this code needs a refactoring
down the road.  This change is just the bare minimum building on
what's there to get SELF port flags up to user-space.  A refactoring
effort should get the port drivers out of parsing/filling netlink msg
and leave that to the core code in rtnetlink.c.  That way we can have
one place for policy checks and one place for fill.  I think this
refactoring effort should be left out in this patch series, otherwise
this is going to drag on into the next year.

>
> cheers,
> jamal
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