netdev - Re: Unable to create htb tc classes more than 64K

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Date:   Fri, 16 Aug 2019 10:45:07 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Akshat Kakkar <akshat.1984@...il.com>
Cc:     NetFilter <netfilter-devel@...r.kernel.org>,
        lartc <lartc@...r.kernel.org>, netdev <netdev@...r.kernel.org>
Subject: Re: Unable to create htb tc classes more than 64K

On Fri, Aug 16, 2019 at 5:49 AM Akshat Kakkar <akshat.1984@...il.com> wrote:
>
> I want to have around 1 Million htb tc classes.
> The simple structure of htb tc class, allow having only 64K classes at once.

This is probably due the limit of class ID which is 16bit for minor.


> But, it is possible to make it more hierarchical using hierarchy of
> qdisc and classes.
> For this I tried something like this
>
> tc qdisc add dev eno2 root handle 100: htb
> tc class add dev eno2 parent 100: classid 100:1 htb rate 100Mbps
> tc class add dev eno2 parent 100: classid 100:2 htb rate 100Mbps
>
> tc qdisc add dev eno2 parent 100:1 handle 1: htb
> tc class add dev eno2 parent 1: classid 1:10 htb rate 100kbps
> tc class add dev eno2 parent 1: classid 1:20 htb rate 300kbps
>
> tc qdisc add dev eno2 parent 100:2 handle 2: htb
> tc class add dev eno2 parent 2: classid 2:10 htb rate 100kbps
> tc class add dev eno2 parent 2: classid 2:20 htb rate 300kbps
>
> What I want is something like:
> tc filter add dev eno2 parent 100: protocol ip prio 1 handle
> 0x00000001 fw flowid 1:10
> tc filter add dev eno2 parent 100: protocol ip prio 1 handle
> 0x00000002 fw flowid 1:20
> tc filter add dev eno2 parent 100: protocol ip prio 1 handle
> 0x00000003 fw flowid 2:10
> tc filter add dev eno2 parent 100: protocol ip prio 1 handle
> 0x00000004 fw flowid 2:20
>
> But I am unable to shape my traffic by any of 1:10, 1:20, 2:10 or 2:20.
>
> Can you please suggest, where is it going wrong?
> Is it not possible altogether?

The filter could only filter for classes on the same level, you are
trying to filter for the children classes, which doesn't work.

Thanks.