linux/net/dsa
Daniel Mack 1ed9ec9b08 dsa: Allow forwarding of redirected IGMP traffic
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>
2020-06-24 14:39:43 -07:00
..
dsa2.c net: dsa: introduce a dsa_switch_find function 2020-05-10 19:52:33 -07:00
dsa_priv.h net: dsa: provide an option for drivers to always receive bridge VLANs 2020-05-12 13:08:07 -07:00
dsa.c net: dsa: introduce a dsa_port_from_netdev public helper 2020-05-07 17:31:57 -07:00
Kconfig treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
Makefile net: dsa: add support for Atheros AR9331 TAG format 2019-12-20 17:05:47 -08:00
master.c net: change addr_list_lock back to static key 2020-06-09 12:59:45 -07:00
port.c net: dsa: provide an option for drivers to always receive bridge VLANs 2020-05-12 13:08:07 -07:00
slave.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-05-31 17:48:46 -07:00
switch.c net: dsa: permit cross-chip bridging between all trees in the system 2020-05-10 19:52:33 -07:00
tag_8021q.c net: dsa: tag_8021q: stop restoring VLANs from bridge 2020-05-29 16:45:46 -07:00
tag_ar9331.c net: dsa: tag_ar9331: Make sure there is headroom for tag 2020-02-14 07:34:51 -08:00
tag_brcm.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-03-25 18:58:11 -07:00
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 2020-06-24 14:39:43 -07:00
tag_gswip.c net: dsa: tag_gswip: fix typo in tagger name 2020-01-16 13:58:26 +01:00
tag_ksz.c net: dsa: ksz: use common define for tag len 2019-12-20 21:06:49 -08:00
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 2020-05-16 13:49:28 -07:00
tag_ocelot.c net: dsa: ocelot: Constify dsa_device_ops 2020-05-11 16:50:45 -07:00
tag_qca.c net: dsa: tag_qca: Make sure there is headroom for tag 2020-02-14 07:34:51 -08:00
tag_sja1105.c net: dsa: tag_sja1105: appease sparse checks for ethertype accessors 2020-05-12 18:02:42 -07:00
tag_trailer.c dsa: Cleanup unneeded table and make tag structures static 2019-04-28 19:41:01 -04:00