net: dsa: sja1105: Add support for traffic through standalone ports
authorVladimir Oltean <olteanv@gmail.com>
Sun, 5 May 2019 10:19:27 +0000 (13:19 +0300)
committerDavid S. Miller <davem@davemloft.net>
Mon, 6 May 2019 04:52:42 +0000 (21:52 -0700)
commit227d07a07ef126272ea2eed97fd136cd7a803d81
treed5004e1438e81abf29266b349005ae3a945f7e72
parentc362beb072e14b929eb657dc174d83ccdd9b0eed
net: dsa: sja1105: Add support for traffic through standalone ports

In order to support this, we are creating a make-shift switch tag out of
a VLAN trunk configured on the CPU port. Termination of normal traffic
on switch ports only works when not under a vlan_filtering bridge.
Termination of management (PTP, BPDU) traffic works under all
circumstances because it uses a different tagging mechanism
(incl_srcpt). We are making use of the generic CONFIG_NET_DSA_TAG_8021Q
code and leveraging it from our own CONFIG_NET_DSA_TAG_SJA1105.

There are two types of traffic: regular and link-local.

The link-local traffic received on the CPU port is trapped from the
switch's regular forwarding decisions because it matched one of the two
DMAC filters for management traffic.

On transmission, the switch requires special massaging for these
link-local frames. Due to a weird implementation of the switching IP, by
default it drops link-local frames that originate on the CPU port.
It needs to be told where to forward them to, through an SPI command
("management route") that is valid for only a single frame.
So when we're sending link-local traffic, we are using the
dsa_defer_xmit mechanism.

Signed-off-by: Vladimir Oltean <olteanv@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/dsa/sja1105/Kconfig
drivers/net/dsa/sja1105/sja1105.h
drivers/net/dsa/sja1105/sja1105_main.c
include/linux/dsa/sja1105.h
include/net/dsa.h
net/dsa/Kconfig
net/dsa/Makefile
net/dsa/tag_sja1105.c [new file with mode: 0644]