netdev - Re: [net-next v5 2/2] net: sched: support hash/classid/cpuid selecting tx queue

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Message-ID: <CAMDZJNVNKP1cgHJKUtPwWUdPR5cZ=v8+t9X6AgHw9FPLi4CmYg@mail.gmail.com>
Date:   Wed, 22 Dec 2021 09:23:54 +0800
From:   Tonghao Zhang <xiangxia.m.yue@...il.com>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Jiri Pirko <jiri@...nulli.us>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Alexander Lobakin <alobakin@...me>,
        Paolo Abeni <pabeni@...hat.com>,
        Talal Ahmad <talalahmad@...gle.com>,
        Kevin Hao <haokexin@...il.com>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Kees Cook <keescook@...omium.org>,
        Kumar Kartikeya Dwivedi <memxor@...il.com>,
        Antoine Tenart <atenart@...nel.org>,
        Wei Wang <weiwan@...gle.com>, Arnd Bergmann <arnd@...db.de>
Subject: Re: [net-next v5 2/2] net: sched: support hash/classid/cpuid
 selecting tx queue

On Tue, Dec 21, 2021 at 1:57 AM Cong Wang <xiyou.wangcong@...il.com> wrote:
>
> On Mon, Dec 20, 2021 at 4:39 AM <xiangxia.m.yue@...il.com> wrote:
> >
> > From: Tonghao Zhang <xiangxia.m.yue@...il.com>
> >
> > This patch allows user to select queue_mapping, range
> > from A to B. And user can use skbhash, cgroup classid
> > and cpuid to select Tx queues. Then we can load balance
> > packets from A to B queue. The range is an unsigned 16bit
> > value in decimal format.
> >
> > $ tc filter ... action skbedit queue_mapping skbhash A B
> >
> > "skbedit queue_mapping QUEUE_MAPPING" (from "man 8 tc-skbedit")
> > is enhanced with flags:
> > * SKBEDIT_F_TXQ_SKBHASH
> > * SKBEDIT_F_TXQ_CLASSID
> > * SKBEDIT_F_TXQ_CPUID
>
> Once again, you are enforcing policies in kernel, which is not good.
> Kernel should just set whatever you give to it, not selecting policies
> like a menu.
I agree that, but for tc/net-sched layer, there are a lot of
networking policies, for example , cls_A, act_B, sch_C.
> Any reason why you can't obtain these values in user-space?
Did you mean that we add this flags to iproute2 tools? This patch for
iproute2, is not post. If the kerenl patches are accepted, I will send
them.


-- 
Best regards, Tonghao