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

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Date:   Sat, 17 Aug 2019 11:24:13 -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 Sat, Aug 17, 2019 at 5:46 AM Akshat Kakkar <akshat.1984@...il.com> wrote:
>
> I agree that it is because of 16bit of minor I'd of class which
> restricts it to 64K.
> Point is, can we use multilevel qdisc and classes to extend it to more
> no. of classes i.e. to more than 64K classes

If your goal is merely having as many classes as you can, then yes.


>
> One scheme can be like
>                                       100: root qdisc
>                                          |
>                                        / | \
>                                      /   |   \
>                                    /     |     \
>                                  /       |       \
>                           100:1   100:2   100:3        child classes
>                             |              |           |
>                             |              |           |
>                             |              |           |
>                            1:            2:          3:     qdisc
>                            / \           / \           / \
>                          /     \                     /     \
>                       1:1    1:2             3:1      3:2 leaf classes
>
> with all qdisc and classes defined as htb.
>
> Is this correct approach? Any alternative??

Again, depends on what your goal is.


>
> Besides, in order to direct traffic to leaf classes 1:1, 1:2, 2:1,
> 2:2, 3:1, 3:2 .... , instead of using filters I am using ipset with
> skbprio and iptables map-set match rule.
> But even after all this it don't work. Why?

Again, the filters you use to classify the packets could only
work for the classes on the same level, no the next level.


Thanks.