[Bug 230996] em/igb: Intel i210/i350: ifconfig: enabling "vlanhwtag" renders VLAN on i210/i350 NICs unusable

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230996

--- Comment #36 from commit-hook@FreeBSD.org ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=2796f7cab10785ef40efbba97ef67ab319c96e9c

commit 2796f7cab10785ef40efbba97ef67ab319c96e9c
Author:     Kevin Bowling <kbowling@FreeBSD.org>
AuthorDate: 2021-09-15 14:47:19 +0000
Commit:     Kevin Bowling <kbowling@FreeBSD.org>
CommitDate: 2021-09-15 15:03:01 +0000

    e1000: Fix up HW vlan ops

    * Don't reset the entire adapter for vlan changes, fix up the problems
    * Add some functions for vlan filter (vfta) manipulation
    * Don't muck with the vfta if we aren't doing HW vlan filtering
    * Disable interrupts when manipulating vfta on lem(4)-class NICs
    * On the I350 there is a specification update (2.4.20) in which the
    suggested workaround is to write to the vfta 10 times (if at first you
    don't succeed, try, try again). Our shared code has the goods, use it
    * Increase a VF's frame receive size in the case of vlans

    From the referenced PR, this reduced vlan configuration from minutes
    to seconds with hundreds or thousands of vlans and prevents wedging the
    adapter with needless adapter reinitialization for each vlan ID.

    PR:             230996
    Reviewed by:    markj
    Tested by:      Ozkan KIRIK <ozkan.kirik@gmail.com>
    MFC after:      2 weeks
    Differential Revision:  https://reviews.freebsd.org/D30002

 sys/dev/e1000/if_em.c | 166 ++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 126 insertions(+), 40 deletions(-)

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