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

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

--- Comment #30 from Kaho Toshikazu <kaho at elam.kais.kyoto-u.ac.jp> ---
(In reply to Kevin Bowling from comment #29)

EVENTHANDLER_REGISTER seems to require (struct ifnet *)
which typedef if_t at if_var.h. When a vlan interface is created/destroyed,
the vlan_config/unconfig handler is called, but I can not observe
any execution of iflib_vlan_register or iflib_vlan_unregister at 
using current code. The conversion form ctx to ifp makes execution of handlers.

Then these handlers are called when a event is happened regardless for
other devices or for itself. The compare is required to pick up a event
related to a device driver. The handler calls with if_t because of
being registered if_t instead of if_ctx_t by the above modification.

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