netdev - Re: [PATCH net-next v6 14/23] bridge: restore br

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Message-ID: <554F8300.5070709@cumulusnetworks.com>
Date:	Sun, 10 May 2015 09:10:40 -0700
From:	roopa <roopa@...ulusnetworks.com>
To:	Jiri Pirko <jiri@...nulli.us>
CC:	sfeldma@...il.com, netdev@...r.kernel.org, linux@...ck-us.net,
	f.fainelli@...il.com, andrew@...n.ch, simon.horman@...ronome.com,
	joe@...ches.com, sridhar.samudrala@...el.com, ronen.arad@...el.com
Subject: Re: [PATCH net-next v6 14/23] bridge: restore br_setlink back to
 original

On 5/9/15, 12:00 PM, Jiri Pirko wrote:
> Sat, May 09, 2015 at 07:40:16PM CEST, sfeldma@...il.com wrote:
>> From: Scott Feldman <sfeldma@...il.com>
>>
>> Restore br_setlink back to original and don't call into SELF port driver.
>> rtnetlink.c:bridge_setlink() already does a call into port driver for SELF.
>>
>> bridge set link cmd defaults to MASTER.  From man page for bridge link set
>> cmd:
>>
>>        self   link setting is configured on specified physical device
>>
>>        master link setting is configured on the software bridge (default)
>>
>> The link setting has two values: the device-side value and the software
>> bridge-side value.  These are independent and settable using the bridge
>> link set cmd by specifying some combination of [master] | [self].
>> Futhermore, the device-side and bridge-side settings have their own initial
>> value, viewable from bridge -d link show cmd.
>>
>> Restoring br_setlink back to original makes rocker (the only in-kernel user
>> of SELF link settings) work as first implement: two-sided values.
>>
>> It's true that when both MASTER and SELF are specified from the command,
>> two netlink notifications are generated, one for each side of the settings.
>> The user-space app can distiquish between the two notifications by
>> observing the MASTER or SELF flag.
> This is revert of:
>
> commit 68e331c785b85b78f4155e2ab6f90e976b609dc1
> Author: Roopa Prabhu <roopa@...ulusnetworks.com>
> Date:   Thu Jan 29 22:40:14 2015 -0800
>
>      bridge: offload bridge port attributes to switch asic if feature flag set
>
> Noting that because I want to make sure everybody is ok with new
> behaviour. I tend to like it more.
>
I am not ok with it. I have raised this earlier. same argument as the 
fib code, app now has to remember to call with both master and self. I 
do however feel that this code needs some rework..,.add to hardware 
first and then software
just like fib and rollback hardware on failure. In which case, i am ok 
with submitting a new patch to do it differently.

thanks,
Roopa

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