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The unsigned vf->num_mac in Ubuntu18.04.1 LTS i40e driver 2.1.14-k will
be decreased to below zero when VF is trying to delete the MAC address
which is added by PF and then add a new MAC address. And after this
issue happens, VF won't be able to send/receive packets, and excepting
for broadcast address, mac_filter_hash is empty in dumped VSI info.

Ubuntu18.04.1 LTS kernel: 4.15.0-38-generic
i40e driver: 2.1.14-k
i40evf driver: 3.0.1-k

Actual results:
The unsigned vf->num_mac should decrease to below zero. The VF port doesn't 

Expected results:
The unsigned vf->num_mac range is from 0 to 65535;
or the vf is not allowed to delete the MAC addr which is added by PF

Corresponding Patch is required for resolving this i40e driver issue

i40e: Prevent deleting MAC address from VF when set by PF

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: bot-comment i40e
The unsigned vf->num_mac will be decreased to below zero and cause the VF port 
not working
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