[Bug 237010] mlx5 with LACP can stop work with vlanhwfilter enabled

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237010

            Bug ID: 237010
           Summary: mlx5 with LACP can stop work with vlanhwfilter enabled
           Product: Base System
           Version: 12.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: ae at FreeBSD.org

We have faced this problem several times, but it is not easy to reproduce.

We use several mce(4) cards in one or two LACP lagg(4). The system is mostly
router with firewall. Each lagg(4) has several vlans. vlanhwfilter is enabled
by default. Each IRQ is bound to dedicated CPU core, but each mce* interface
shares CPU cores with each other. The number of queues is limited to 26, the
last two are dedicated to user processes.

The problem can occur when management software does some network
reconfiguration, i.e. creates new vlan interfaces or destroys some old.
Looks like the system stops receiving any packets. If we turn off vlanhwfilter
via ipmi console, it starts work again. At the moment when problem occurs, the
network loading is about 500-800kpps. 
It seems this can not be reproduced with single card, i.e. without LACP lagg.

We already saw this problem in 11-CURRENT, 12-CURRENT, 12-STABLE. But since our
configuration is very specific with patches to driver, this report is mostly
JFYI. For now we just disable vlanhwfilter by default.

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