netdev - [PATCH RFC net-next 0/3] Multi-CPU DSA support

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Date:   Sat, 10 Apr 2021 15:34:46 +0200
From:   Ansuel Smith <ansuelsmth@...il.com>
To:     netdev@...r.kernel.org
Cc:     Ansuel Smith <ansuelsmth@...il.com>,
        "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>,
        Weilong Chen <chenweilong@...wei.com>,
        Marek Behún <marek.behun@....cz>,
        Roopa Prabhu <roopa@...ulusnetworks.com>,
        Di Zhu <zhudi21@...wei.com>,
        Francis Laniel <laniel_francis@...vacyrequired.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH RFC net-next 0/3] Multi-CPU DSA support

Hi,
this is a respin of the Marek series in hope that this time we can
finally make some progress with dsa supporting multi-cpu port.

This implementation is similar to the Marek series but with some tweaks.
This adds support for multiple-cpu port but leave the driver the
decision of the type of logic to use about assigning a CPU port to the
various port. The driver can also provide no preference and the CPU port
is decided using a round-robin way.

(copying the Marek cover letter)
Patch 2 adds a new operation to the net device operations structure.
Currently we use the iflink property of a net device to report to which
CPU port a given switch port si connected to. The ip link utility from
iproute2 reports this as "lan1@...0". We add a new net device operation,
ndo_set_iflink, which can be used to set this property. We call this
function from the netlink handlers.

Patch 3 implements this new ndo_set_iflink operation for DSA slave
device. Thus the userspace can request a change of CPU port of a given
port. The mac address is changed accordingly following the CPU port mac
address.

There are at least 2 driver that would benefit from this and currently
now works using half their capabilities. (qca8k and mv88e6xxx)
This current series is tested with qca8k. 

Ansuel Smith (1):
  net: dsa: allow for multiple CPU ports

Marek Behún (2):
  net: add ndo for setting the iflink property
  net: dsa: implement ndo_set_netlink for chaning port's CPU port

 include/linux/netdevice.h |  5 +++
 include/net/dsa.h         |  7 +++++
 net/core/dev.c            | 15 +++++++++
 net/core/rtnetlink.c      |  7 +++++
 net/dsa/dsa2.c            | 66 ++++++++++++++++++++++++++++-----------
 net/dsa/slave.c           | 31 ++++++++++++++++++
 6 files changed, 112 insertions(+), 19 deletions(-)

-- 
2.30.2