netdev - Re: [patch net-next v2 0/9] net: sched: introduce chain templates support with offloading to mlxsw

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Date:   Fri, 29 Jun 2018 08:12:21 -0400
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     Jiri Pirko <jiri@...nulli.us>,
        Cong Wang <xiyou.wangcong@...il.com>, g@...opsycho.orion
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Simon Horman <simon.horman@...ronome.com>,
        john.hurley@...ronome.com, David Ahern <dsahern@...il.com>,
        mlxsw@...lanox.com, sridhar.samudrala@...el.com
Subject: Re: [patch net-next v2 0/9] net: sched: introduce chain templates
 support with offloading to mlxsw

On 29/06/18 04:39 AM, Jiri Pirko wrote:
> Fri, Jun 29, 2018 at 12:25:53AM CEST, xiyou.wangcong@...il.com wrote:
>> On Thu, Jun 28, 2018 at 6:10 AM Jiri Pirko <jiri@...nulli.us> wrote:
>>> Add a template of type flower allowing to insert rules matching on last
>>> 2 bytes of destination mac address:
>>> # tc chaintemplate add dev dummy0 ingress proto ip flower dst_mac 00:00:00:00:00:00/00:00:00:00:FF:FF
>>>
>>> The template is now showed in the list:
>>> # tc chaintemplate show dev dummy0 ingress
>>> chaintemplate flower chain 0
>>>    dst_mac 00:00:00:00:00:00/00:00:00:00:ff:ff
>>>    eth_type ipv4
>>>
>>> Add another template, this time for chain number 22:
>>> # tc chaintemplate add dev dummy0 ingress proto ip chain 22 flower dst_ip 0.0.0.0/16
>>> # tc chaintemplate show dev dummy0 ingress
>>> chaintemplate flower chain 0
>>>    dst_mac 00:00:00:00:00:00/00:00:00:00:ff:ff
>>>    eth_type ipv4
>>> chaintemplate flower chain 22
>>>    eth_type ipv4
>>>    dst_ip 0.0.0.0/16
>>
>> So, if I want to check the template of a chain, I have to use
>> 'tc chaintemplate... chain X'.
>>
>> If I want to check the filters in a chain, I have to use
>> 'tc filter show .... chain X'.
>>
>> If you introduce 'tc chain', it would just need one command:
>> `tc chain show ... X` which could list its template first and
>> followed by filters in this chain, something like:
>>
>> # tc chain show dev eth0 chain X
>> template: # could be none
>> ....
>> filter1
>> ...
>> filter2
>> ...
>>
>> Isn't it more elegant?
> 
> Well, that is just another iproute2 command. It would use the same
> kernel uapi. Filters+templates. Sure, why not. Can be easily introduced.
> Let's do it in a follow-up iproute2 patch.
> 

Half a dozen or 6 - take your pick, really.
I would call the template an attribute as opposed to a stand alone
object i.e A chain of filters may have a template. If you have to
introduce a new object then Sridhar's suggested syntax seems appealing.

cheers,
jamal