[Bug 231151] ifconfig: unable to disable rxcsum, rxcsum6 and vlanhwcsum on em driver

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231151

--- Comment #11 from Shirkdog <mshirk at daemon-security.com> ---
(In reply to Stephen Hurd from comment #9)

rebuilt and tested using the update and they appear to be honored (running
ifconfig em0 promisc up at boot:


# ifconfig em0
em0: flags=28943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST,PPROMISC>
metric 0 mtu 1500                                                               
       
options=81049b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,LRO,VLAN_HWFILTER> 
        ether 68:05:ca:33:42:f0                                                 
        media: Ethernet autoselect (1000baseT <full-duplex>)                    
        status: active                                                          
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>                    
# ifconfig em0 -rxcsum -txcsum -tso4 -tso6 -lro -rxcsum6 -txcsum6 -vlanhwcsum
-vlanhwtso                                              
# ifconfig em0                                                                  
em0: flags=28943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST,PPROMISC>
metric 0 mtu 1500                                                               
        options=810018<VLAN_MTU,VLAN_HWTAGGING,VLAN_HWFILTER>                   
        ether 68:05:ca:33:42:f0                                                 
        media: Ethernet autoselect (1000baseT <full-duplex>)                    
        status: active                                                          
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>                    

I did notice that I no longer observed the any of the IPv6 flags when I try to
enable them, and this interface has no IP configuration. But I am testing
sniffing on the interface and will report back if I have any issues.

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