netdev - Re: [PATCH v3 net-next] net/sched: add skbprio scheduler

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Date:   Tue, 10 Jul 2018 19:25:53 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
Cc:     Michel Machado <michel@...irati.com.br>,
        Nishanth Devarajan <ndev2021@...il.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Jiri Pirko <jiri@...nulli.us>,
        David Miller <davem@...emloft.net>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Cody Doucette <doucette@...edu>
Subject: Re: [PATCH v3 net-next] net/sched: add skbprio scheduler

On Mon, Jul 9, 2018 at 2:40 PM Marcelo Ricardo Leitner
<marcelo.leitner@...il.com> wrote:
>
> On Mon, Jul 09, 2018 at 05:03:31PM -0400, Michel Machado wrote:
> >    Changing TC_PRIO_MAX from 15 to 63 risks breaking backward compatibility
> > with applications.
>
> If done, it needs to be done carefully, indeed. I don't know if it's
> doable, neither I know how hard is your requirement for 64 different
> priorities.

struct tc_prio_qopt {
        int     bands;                  /* Number of bands */
        __u8    priomap[TC_PRIO_MAX+1]; /* Map: logical priority -> PRIO band */
};

How would you do it carefully?

Also, it is not only used by prio but also pfifo_fast.