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From:   DENG Qingfang <dqfext@gmail.com>
To:     Vladimir Oltean <olteanv@gmail.com>
Cc:     Marek Behun <marek.behun@nic.cz>,
        Ansuel Smith <ansuelsmth@gmail.com>, netdev@vger.kernel.org,
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        Cong Wang <cong.wang@bytedance.com>,
        Taehee Yoo <ap420073@gmail.com>,
        =?iso-8859-1?Q?Bj=F6rn_T=F6pel?= <bjorn@kernel.org>,
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        Roopa Prabhu <roopa@cumulusnetworks.com>,
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        linux-kernel@vger.kernel.org
Subject: Re: [PATCH RFC net-next 0/3] Multi-CPU DSA support
Date:   Mon, 12 Apr 2021 23:00:45 +0800
Message-Id: <20210412150045.929508-1-dqfext@gmail.com>
In-Reply-To: <20210411185017.3xf7kxzzq2vefpwu@skbuf>
References: <20210410133454.4768-1-ansuelsmth@gmail.com> <20210411200135.35fb5985@thinkpad> <20210411185017.3xf7kxzzq2vefpwu@skbuf>
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On Sun, Apr 11, 2021 at 09:50:17PM +0300, Vladimir Oltean wrote:
> 
> So I'd be tempted to say 'tough luck' if all your ports are not up, and
> the ones that are are assigned statically to the same CPU port. It's a
> compromise between flexibility and simplicity, and I would go for
> simplicity here. That's the most you can achieve with static assignment,
> just put the CPU ports in a LAG if you want better dynamic load balancing
> (for details read on below).
> 

Many switches such as mv88e6xxx only support MAC DA/SA load balancing,
which make it not ideal in router application (Router WAN <--> ISP BRAS
traffic will always have the same DA/SA and thus use only one port).