Please merge this change to stable/12 branch until a proper fix is
done. 

---
Yoshihiro Takahashi <n...@freebsd.org>

In article <202006111559.05bfxnsa070...@repo.freebsd.org>
Eric Joyner <e...@freebsd.org> writes:

> Author: erj
> Date: Thu Jun 11 15:59:49 2020
> New Revision: 362063
> URL: https://svnweb.freebsd.org/changeset/base/362063
> 
> Log:
>   em(4): Always reinit interface when adding/removing VLAN
>   
>   This partially reverts r361053 since there have been reports
>   by users that this breaks some functionality for em(4)
>   devices; it seems at first glance that some sort of interface
>   restart is required for those cards.
>   
>   This isn't a proper fix; this unbreaks those users until a proper
>   fix is found for their issues.
>   
>   PR:         240818
>   Reported by:        Marek Zarychta <zarych...@plan-b.pwste.edu.pl>
>   MFC after:  3 days
> 
> Modified:
>   head/sys/dev/e1000/if_em.c
> 
> Modified: head/sys/dev/e1000/if_em.c
> ==============================================================================
> --- head/sys/dev/e1000/if_em.c        Thu Jun 11 15:17:13 2020        
> (r362062)
> +++ head/sys/dev/e1000/if_em.c        Thu Jun 11 15:59:49 2020        
> (r362063)
> @@ -4059,7 +4059,6 @@ em_if_needs_restart(if_ctx_t ctx __unused, enum iflib_
>  {
>       switch (event) {
>       case IFLIB_RESTART_VLAN_CONFIG:
> -             return (false);
>       default:
>               return (true);
>       }
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