linux-kernel - Re: [PATCH RFC net-next 0/3] Multi-CPU DSA support

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Message-Id: <20210412150045.929508-1-dqfext@gmail.com>
Date:   Mon, 12 Apr 2021 23:00:45 +0800
From:   DENG Qingfang <dqfext@...il.com>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Marek Behun <marek.behun@....cz>,
        Ansuel Smith <ansuelsmth@...il.com>, netdev@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andriin@...com>,
        Eric Dumazet <edumazet@...gle.com>,
        Wei Wang <weiwan@...gle.com>,
        Cong Wang <cong.wang@...edance.com>,
        Taehee Yoo <ap420073@...il.com>,
        Björn Töpel <bjorn@...nel.org>,
        zhang kai <zhangkaiheb@....com>,
        Weilong Chen <chenweilong@...wei.com>,
        Roopa Prabhu <roopa@...ulusnetworks.com>,
        Di Zhu <zhudi21@...wei.com>,
        Francis Laniel <laniel_francis@...vacyrequired.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC net-next 0/3] Multi-CPU DSA support

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).