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

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Date:   Sat, 24 Aug 2019 04:42:47 +0200
From:   Marek Behún <marek.behun@....cz>
To:     netdev@...r.kernel.org
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        David Ahern <dsahern@...il.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Marek Behún <marek.behun@....cz>
Subject: [PATCH RFC net-next 0/3] Multi-CPU DSA support

Hi,
this is my attempt to solve the multi-CPU port issue for DSA.

Patch 1 adds code for handling multiple CPU ports in a DSA switch tree.
If more than one CPU port is found in a tree, the code assigns CPU ports
to user/DSA ports in a round robin way. So for the simplest case where
we have one switch with N ports, 2 of them of type CPU connected to eth0
and eth1, and the other ports labels being lan1, lan2, ..., the code
assigns them to CPU ports this way:
  lan1 <-> eth0
  lan2 <-> eth1
  lan3 <-> eth0
  lan4 <-> eth1
  lan5 <-> eth0
  ...

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.

I am also sending patch for iproute2-next, to add support for setting
this iflink value.

Marek

Marek Behún (3):
  net: dsa: allow for multiple CPU ports
  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         | 11 ++++-
 net/core/dev.c            | 15 +++++++
 net/core/rtnetlink.c      |  7 ++++
 net/dsa/dsa2.c            | 84 +++++++++++++++++++++++++--------------
 net/dsa/slave.c           | 35 ++++++++++++++++
 6 files changed, 126 insertions(+), 31 deletions(-)

-- 
2.21.0