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

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Date:   Thu, 28 Jun 2018 15:25:53 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Jiri Pirko <jiri@...nulli.us>
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

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?