[Bug 282095] enic breaks when changing MTU on interfaces with fib other than 0

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=282095

--- Comment #3 from Scott Aitken <[email protected]> ---
This driver may have multiple issues, and if required I'll raise another for
throughput.

To further the troubleshooting of the MTU change issue, I discovered that
traffic doesn't completely stop after changing the MTU, however continuous
pings with default values results in:

# setfib 1 ping 172.12.2.1
PING 172.12.2.1 (172.12.2.1): 56 data bytes
64 bytes from 172.12.2.1: icmp_seq=0 ttl=64 time=24391.545 ms
64 bytes from 172.12.2.1: icmp_seq=1 ttl=64 time=23332.953 ms
^C
--- 172.12.2.1 ping statistics ---
31 packets transmitted, 2 packets received, 93.5% packet loss
round-trip min/avg/max/stddev = 23332.953/23862.249/24391.545/529.296 ms

This was with a PCI NIC rather than the MLOM:
enic2: <Cisco VIC Ethernet NIC> port 0x4000-0x407f mem
0xc7010000-0xc7017fff,0xc7018000-0xc7019fff irq 44 at device 0.0 numa-domain 0
on pci20

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