netdev - Re: [patch net-next v7 09/13] net: sched: allow ingress and clsact qdiscs to share filter blocks

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Date:   Thu, 11 Jan 2018 12:02:39 -0500
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     Jiri Pirko <jiri@...nulli.us>
Cc:     netdev@...r.kernel.org, davem@...emloft.net,
        xiyou.wangcong@...il.com, mlxsw@...lanox.com, andrew@...n.ch,
        vivien.didelot@...oirfairelinux.com, f.fainelli@...il.com,
        michael.chan@...adcom.com, ganeshgr@...lsio.com,
        saeedm@...lanox.com, matanb@...lanox.com, leonro@...lanox.com,
        idosch@...lanox.com, jakub.kicinski@...ronome.com,
        simon.horman@...ronome.com, pieter.jansenvanvuuren@...ronome.com,
        john.hurley@...ronome.com, alexander.h.duyck@...el.com,
        ogerlitz@...lanox.com, john.fastabend@...il.com,
        daniel@...earbox.net, dsahern@...il.com
Subject: Re: [patch net-next v7 09/13] net: sched: allow ingress and clsact
 qdiscs to share filter blocks

On 18-01-11 11:15 AM, Jiri Pirko wrote:
> Thu, Jan 11, 2018 at 04:44:32PM CET, jhs@...atatu.com wrote:
>> On 18-01-11 10:07 AM, Jiri Pirko wrote:
>>> Thu, Jan 11, 2018 at 03:46:09PM CET, jhs@...atatu.com wrote:
>>>> On 18-01-11 09:41 AM, Jiri Pirko wrote:
>>>>> Thu, Jan 11, 2018 at 03:37:08PM CET, jhs@...atatu.com wrote:
>>
>>>>
>>>> I only looked at the kernel code. Good you can stop it at tc
>>>> but the API does not stop it (unless you expect the rest of the
>>>> world to only use tc).
>>>
>>> Jamal, apparently, you did not looked at the kernel code either :)
>>> Look at the changes done in net/sched/sch_ingress.c - there is where the
>>> parsing of block attr takes place.
>>>
>>
>> reason i raised it is from looking at tc_ctl_tfilter().
>> If i specify ifindex != TCM_IFINDEX_MAGIC_BLOCK,
>> parent = 0XFFFF.... and block = 22 that should work, no?
>> i.e regardless of whether parent is INGRESS etc.
> 
> No, the block needs to be created first by qdisc instance.
> Seems to me that you are mixing apples and oranges a bit.
> 

You are correct, the qdisc attachment must exist first ;->


>> TCA_BLOCK sounds appealing - could be a speacial tlv with many block ids
>> maybe? I really would like to use this for egress as well - and what
>> i described earlier should work for me.
> 
> I don't get what you mean by "tlv with many block ids". What is it good
> for? :O
>

I meant A TLV with a bunch of 32 bit values, so you can have more than
one block id in it. But what Roopa suggested is more explicit (and
better).

cheers,
jamal