linux-stable/net/dsa
Daniel Mack b3dacce502 dsa: Allow forwarding of redirected IGMP traffic
commit 1ed9ec9b08 upstream.

The driver for Marvell switches puts all ports in IGMP snooping mode
which results in all IGMP/MLD frames that ingress on the ports to be
forwarded to the CPU only.

The bridge code in the kernel can then interpret these frames and act
upon them, for instance by updating the mdb in the switch to reflect
multicast memberships of stations connected to the ports. However,
the IGMP/MLD frames must then also be forwarded to other ports of the
bridge so external IGMP queriers can track membership reports, and
external multicast clients can receive query reports from foreign IGMP
queriers.

Currently, this is impossible as the EDSA tagger sets offload_fwd_mark
on the skb when it unwraps the tagged frames, and that will make the
switchdev layer prevent the skb from egressing on any other port of
the same switch.

To fix that, look at the To_CPU code in the DSA header and make
forwarding of the frame possible for trapped IGMP packets.

Introduce some #defines for the frame types to make the code a bit more
comprehensive.

This was tested on a Marvell 88E6352 variant.

Signed-off-by: Daniel Mack <daniel@zonque.org>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Tested-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Cc: DENG Qingfang <dqfext@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-09-23 12:40:33 +02:00
..
dsa.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
dsa2.c net: dsa: Do not make user port errors fatal 2020-05-20 08:20:03 +02:00
dsa_priv.h net: dsa: fix phylink_start()/phylink_stop() calls 2020-03-18 07:17:39 +01:00
Kconfig net: dsa: microchip: remove NET_DSA_TAG_KSZ_COMMON 2019-09-12 11:36:12 +01:00
Makefile net: dsa: microchip: remove NET_DSA_TAG_KSZ_COMMON 2019-09-12 11:36:12 +01:00
master.c net: dsa: Do not leave DSA master with NULL netdev_ops 2020-05-14 07:58:20 +02:00
port.c net: dsa: Don't instantiate phylink for CPU/DSA ports unless needed 2020-03-18 07:17:47 +01:00
slave.c net: dsa: declare lockless TX feature for slave ports 2020-06-03 08:21:38 +02:00
switch.c net: dsa: program VLAN on CPU port from slave 2019-08-27 20:17:28 -07:00
tag_8021q.c net: dsa: tag_8021q: replace dsa_8021q_remove_header with __skb_vlan_pop 2020-04-01 11:01:34 +02:00
tag_brcm.c net: dsa: Fix duplicate frames flooded by learning 2020-04-01 11:01:33 +02:00
tag_dsa.c dsa: Cleanup unneeded table and make tag structures static 2019-04-28 19:41:01 -04:00
tag_edsa.c dsa: Allow forwarding of redirected IGMP traffic 2020-09-23 12:40:33 +02:00
tag_gswip.c net: dsa: tag_gswip: fix typo in tagger name 2020-01-23 08:22:52 +01:00
tag_ksz.c net: dsa: ksz: Add KSZ8795 tag code 2019-07-30 15:12:50 -07:00
tag_lan9303.c dsa: Cleanup unneeded table and make tag structures static 2019-04-28 19:41:01 -04:00
tag_mtk.c net: dsa: mt7530: fix roaming from DSA user ports 2020-06-03 08:20:43 +02:00
tag_qca.c net: dsa: tag_qca: Make sure there is headroom for tag 2020-02-24 08:36:22 +01:00
tag_sja1105.c net: dsa: tag_8021q: replace dsa_8021q_remove_header with __skb_vlan_pop 2020-04-01 11:01:34 +02:00
tag_trailer.c dsa: Cleanup unneeded table and make tag structures static 2019-04-28 19:41:01 -04:00