netdev - Re: [PATCH RFC net-next 1/3] net: dsa: allow for multiple CPU ports

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Date:   Mon, 12 Apr 2021 23:30:58 +0800
From:   DENG Qingfang <dqfext@...il.com>
To:     Ansuel Smith <ansuelsmth@...il.com>
Cc:     netdev@...r.kernel.org,
        Marek Behún <marek.behun@....cz>,
        "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>,
        Vladimir Oltean <olteanv@...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>,
        Roopa Prabhu <roopa@...ulusnetworks.com>,
        Di Zhu <zhudi21@...wei.com>,
        Nikolay Aleksandrov <nikolay@...dia.com>,
        Francis Laniel <laniel_francis@...vacyrequired.com>,
        linux-kernel@...r.kernel.org,
        Frank Wunderlich <frank-w@...lic-files.de>
Subject: Re: [PATCH RFC net-next 1/3] net: dsa: allow for multiple CPU ports

On Mon, Apr 12, 2021 at 06:41:58AM +0200, Ansuel Smith wrote:
> > So, drivers will read the name of every port and decide which CPU port
> > does it use?
> >
> 
> Yes, this seems to be an acceptable path to follow. The driver can
> provide a preferred CPU port or just tell DSA that every cpu is equal
> and assign them in a round-robin.
> 

So we somehow configured default CPU port in dts (by port name). In
my opinion we can just add a default CPU property in dts to specify
it (like Frank Wunderlich did earlier), and fall back to round-robin
if the property is not present, while still allow users to change it
in userspace.