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 10:39:10 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Cong Wang <xiyou.wangcong@...il.com>, g@...opsycho.orion
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        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

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.