netdev - Re: [patch net-next RFC 0/4] introduce infrastructure for support of switch chip datapath

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Message-ID: <53334629.5030208@cumulusnetworks.com>
Date:	Wed, 26 Mar 2014 14:27:05 -0700
From:	Roopa Prabhu <roopa@...ulusnetworks.com>
To:	Jiri Pirko <jiri@...nulli.us>
CC:	Jamal Hadi Salim <jhs@...atatu.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Neil Horman <nhorman@...driver.com>,
	Thomas Graf <tgraf@...g.ch>, netdev <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Andy Gospodarek <andy@...yhouse.net>,
	dborkman <dborkman@...hat.com>, ogerlitz <ogerlitz@...lanox.com>,
	jesse <jesse@...ira.com>, pshelar <pshelar@...ira.com>,
	azhou <azhou@...ira.com>, Ben Hutchings <ben@...adent.org.uk>,
	Stephen Hemminger <stephen@...workplumber.org>,
	jeffrey.t.kirsher@...el.com, vyasevic <vyasevic@...hat.com>,
	Cong Wang <xiyou.wangcong@...il.com>,
	John Fastabend <john.r.fastabend@...el.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Scott Feldman <sfeldma@...ulusnetworks.com>,
	Lennert Buytenhek <buytenh@...tstofly.org>,
	Shrijeet Mukherjee <shm@...ulusnetworks.com>
Subject: Re: [patch net-next RFC 0/4] introduce infrastructure for support
 of switch chip datapath

On 3/26/14, 11:03 AM, Jiri Pirko wrote:
> Wed, Mar 26, 2014 at 06:47:15PM CET, roopa@...ulusnetworks.com wrote:
>> On 3/26/14, 9:59 AM, Jiri Pirko wrote:
>>> Wed, Mar 26, 2014 at 05:54:17PM CET, roopa@...ulusnetworks.com wrote:
>>>> On 3/26/14, 3:54 AM, Jamal Hadi Salim wrote:
>>>>> On 03/26/14 01:37, Roopa Prabhu wrote:
>>>>>> On 3/25/14, 1:11 PM, Florian Fainelli wrote:
>>>>>>> 2014-03-25 12:35 GMT-07:00 Neil Horman <nhorman@...driver.com>:
>>>>>> Sorry about getting on this thread late and possibly in the middle.
>>>>>> Agree on the idea of keeping the ports linked to the master switch dev
>>>>>> (or the 'conduit' to the switch chip) via private list instead of the
>>>>>> master-slave relationship proposed earlier.
>>>>>> By private i mean the netdev->priv linkage to the master switch dev and
>>>>>> not really keeping the ports from being exposed to the user.
>>>>>>
>>>>>> We think its better to keep the switch ports exposed as any other netdev
>>>>>> on linux.
>>>>>>   This approach will make the switch ports look exactly like a nic port
>>>>>> and all tools will continue to work seamlessly. The switch port
>>>>>> operations could internally be forwarded to the switch netdev (sw1 in
>>>>>> the above case).
>>>>>>
>>>>>> example:
>>>>>> $ip link set dev sw1p0 up
>>>>>> $ethtool -S sw1p0
>>>>>>
>>>>> I like the approach. I know the above is a simple version, but i am
>>>>> assuming you also mean i can do things like
>>>>> ip route add ...
>>>>> bridge fdb add ... (and if you like your brctl go ahead)
>>>>> bonding ...
>>>>>
>>>> yes, exactly.  We support this model on our boxes today.
>>>> User can bond switch ports on our box in the exact same way as he/she
>>>> would bond two nic ports.
>>>> Our 'conduit to switch chip' reflects the corresponding lag
>>>> configuration in the switch chip.
>>>> Same goes for bridging, routing, acls.
>>> So you implement bonding netlink api? Or you hook into bonding driver
>>> itselt? Can you show us the code?
>> We use the netlink API and libnl. In our current model, our switch
>> chip driver listens to netlink notifications and programs the switch
>> chip. The switch chip driver uses libnl caches and libnl netlink apis
>> to reflect the kernel state to switch chip.
>
> So when you configure for example bonding over 2 ports, you actually use
> bonding driver to do that. And you userspace app listens to
> notifications and programs the switch chip accordingly. Am I close?
yes correct.
>
> How about data? Is this new "bonding" interface able to assign ip to is
> and send/receive packets.
yes
>
> I'm still not sure I understand your concept. Do you have some
> documentation for it available?
>
I think the only documentation available today in this area is the user 
guide and that in-turn points to native linux command manpages iproute2, 
sysfs, debian ifupdown etc.
I will see if i can find anything else.

thanks,
Roopa
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