From f1158fbcf63c190fb4f7686075ab99f2aee98a92 Mon Sep 17 00:00:00 2001 From: DENG Qingfang Date: Mon, 22 Feb 2021 13:38:11 +0800 Subject: kernel: DSA roaming fix for Marvell mv88e6xxx Marvell mv88e6xxx switch series cannot perform MAC learning from CPU-injected (FROM_CPU) DSA frames, which results in 2 issues. - excessive flooding, due to the fact that DSA treats those addresses as unknown - the risk of stale routes, which can lead to temporary packet loss Backport those patch series from netdev mailing list, which solve these issues by adding and clearing static entries to the switch's FDB. Add a hack patch to set default VID to 1 in port_fdb_{add,del}. Otherwise the static entries will be added to the switch's private FDB if VLAN filtering disabled, which will not work. The switch may generate an "ATU violation" warning when a client moves from the CPU port to a switch port because the static ATU entry added by DSA core still points to the CPU port. DSA core will then clear the static entry so it is not fatal. Disable the warning so it will not confuse users. Link: https://lore.kernel.org/netdev/20210106095136.224739-1-olteanv@gmail.com/ Link: https://lore.kernel.org/netdev/20210116012515.3152-1-tobias@waldekranz.com/ Ref: https://gitlab.nic.cz/turris/turris-build/-/issues/165 Signed-off-by: DENG Qingfang (cherry picked from commit 920eaab1d8179035d0ae1047e75cf9a50da6a6eb) --- ...xxx-Request-assisted-learning-on-CPU-port.patch | 27 ++++++++++++++++++++++ 1 file changed, 27 insertions(+) create mode 100644 target/linux/generic/pending-5.4/768-net-dsa-mv88e6xxx-Request-assisted-learning-on-CPU-port.patch (limited to 'target/linux/generic/pending-5.4/768-net-dsa-mv88e6xxx-Request-assisted-learning-on-CPU-port.patch') diff --git a/target/linux/generic/pending-5.4/768-net-dsa-mv88e6xxx-Request-assisted-learning-on-CPU-port.patch b/target/linux/generic/pending-5.4/768-net-dsa-mv88e6xxx-Request-assisted-learning-on-CPU-port.patch new file mode 100644 index 0000000000..cb421f164b --- /dev/null +++ b/target/linux/generic/pending-5.4/768-net-dsa-mv88e6xxx-Request-assisted-learning-on-CPU-port.patch @@ -0,0 +1,27 @@ +From: Tobias Waldekranz +Subject: [RFC net-next 7/7] net: dsa: mv88e6xxx: Request assisted learning on CPU port +Date: Sat, 16 Jan 2021 02:25:15 +0100 +Archived-At: + +While the hardware is capable of performing learning on the CPU port, +it requires alot of additions to the bridge's forwarding path in order +to handle multi-destination traffic correctly. + +Until that is in place, opt for the next best thing and let DSA sync +the relevant addresses down to the hardware FDB. + +Signed-off-by: Tobias Waldekranz +--- + drivers/net/dsa/mv88e6xxx/chip.c | 1 + + 1 file changed, 1 insertion(+) + +--- a/drivers/net/dsa/mv88e6xxx/chip.c ++++ b/drivers/net/dsa/mv88e6xxx/chip.c +@@ -5080,6 +5080,7 @@ static int mv88e6xxx_register_switch(str + ds->ops = &mv88e6xxx_switch_ops; + ds->ageing_time_min = chip->info->age_time_coeff; + ds->ageing_time_max = chip->info->age_time_coeff * U8_MAX; ++ ds->assisted_learning_on_cpu_port = true; + + dev_set_drvdata(dev, ds); + -- cgit v1.2.3