linux/net/dsa
Vladimir Oltean 8c924369cb net: dsa: refuse cross-chip mirroring operations
In case of a tc mirred action from one switch to another, the behavior
is not correct. We simply tell the source switch driver to program a
mirroring entry towards mirror->to_local_port = to_dp->index, but it is
not even guaranteed that the to_dp belongs to the same switch as dp.

For proper cross-chip support, we would need to go through the
cross-chip notifier layer in switch.c, program the entry on cascade
ports, and introduce new, explicit API for cross-chip mirroring, given
that intermediary switches should have introspection into the DSA tags
passed through the cascade port (and not just program a port mirror on
the entire cascade port). None of that exists today.

Reject what is not implemented so that user space is not misled into
thinking it works.

Fixes: f50f212749 ("net: dsa: Add plumbing for port mirroring")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20241008094320.3340980-1-vladimir.oltean@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-10-09 19:41:35 -07:00
..
conduit.c
conduit.h
devlink.c
devlink.h
dsa.c net: dsa: improve shutdown sequence 2024-10-01 09:56:36 +02:00
dsa.h
Kconfig
Makefile
netlink.c
netlink.h
port.c
port.h
stubs.c
switch.c
switch.h
tag.c net: dsa: provide a software untagging function on RX for VLAN-aware bridges 2024-08-16 09:59:32 +01:00
tag.h net: dsa: provide a software untagging function on RX for VLAN-aware bridges 2024-08-16 09:59:32 +01:00
tag_8021q.c
tag_8021q.h
tag_ar9331.c
tag_brcm.c
tag_dsa.c
tag_gswip.c
tag_hellcreek.c
tag_ksz.c net: dsa: microchip: update tag_ksz masks for KSZ9477 family 2024-09-10 17:27:56 -07:00
tag_lan9303.c
tag_mtk.c
tag_none.c
tag_ocelot.c net: mscc: ocelot: use ocelot_xmit_get_vlan_info() also for FDMA and register injection 2024-08-16 09:59:32 +01:00
tag_ocelot_8021q.c
tag_qca.c
tag_rtl4_a.c
tag_rtl8_4.c
tag_rzn1_a5psw.c
tag_sja1105.c
tag_trailer.c
tag_vsc73xx_8021q.c
tag_xrs700x.c
trace.c
trace.h
user.c net: dsa: refuse cross-chip mirroring operations 2024-10-09 19:41:35 -07:00
user.h