On 1/1/2020 10:07 AM, Pali Rohár wrote:

On Wednesday 01 January 2020 17:30:14 Russell King - ARM Linux admin wrote:

quoted

I think the most important thing to do if you're suffering problems
like this is to monitor and analyse packets being received from the
DSA switch on the host interface:

# tcpdump -enXXi $host_dsa_interface

Hello Russell! Main dsa interface for me is eth0 and it does not see any
incoming vlan tagged packets. (Except that sometimes for those 5 minutes
periods it sometimes see them. And when tcpdump saw them also they
arrived to userspace.)

Based on your description it sounds like there is possibly an address
learning issue, which is why the ATU patches that Russell mentioned
(latest I know are available at [1]) could come in handy.

[1]: https://github.com/vivien/linux/tree/dsa/debugfs

Since this is a DSA set-up, you could try a few things to isolate the
problems further:

- if you keep the same MAC address for wan and wan.10 does the problem
go away? If so, this could suggest that the DSA master network device
driver potentially has a problem with programming its receive filter for
other unicast MAC addresses than the default one (more on that below)

- if your DSA master supports receive VLAN filter offload
(NETIF_F_HW_VLAN_CTAG_FILTER) does it work better if you turn it off?

- does it help if you go back to a kernel before and not including v5.1
which does not have commit 061f6a505ac33659eab007731c0f6374df39ab55
("net: dsa: Add ndo_vlan_rx_{add, kill}_vid implementation") or if you
can change your kernel, try something similar to [2] for mv88e6xxx and
see if it helps

[2]:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e9bf96943b408e6c99dd13fb01cb907335787c61

Regarding the programing of MAC addresses happening through
ndo_set_rx_mode(), we should program static unicast and multicast
addresses when dev_{mc,uc}_sync() gets called similar to [3] because
those addresses are static in nature and the host stack can add/remove
them accordingly. This would help with aging as much as unknown/known
multicast traffic. I will try to cook something later this week.

[3]:
https://github.com/ffainelli/linux/commit/f91b53449e0346a8d7157e5a9225faaa810cbeab
--
Florian