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

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

Zhenlei Huang <zlei@FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |zlei@FreeBSD.org

--- Comment #1 from Zhenlei Huang <zlei@FreeBSD.org> ---
I have a two ports Chelsio T520-CR card. With the default MTU 1500, either TCP
or UDP mode iperf3 can easily reach ~9.6Gbps. For UDP the loss rate is also
negligible.

I think only ~3.7Gb/s for a 10G nic with default MTU 1500 is not reasonable.
Well the enic(4) driver was introduced on Feb 6 2023. That is quite new.

I moved cxl1 to a separated vnet while doing the benchmark. For multiple fibs
setup, the result is similar.

```
# jail -ic vnet persist
1
# ifconfig cxl1 vnet 1
# jexec 1 ifconfig cxl1 inet 192.168.99.1/31
# jexec 1 iperf3 -sD
# ifconfig cxl0 inet 192.168.99.0/31

# iperf3 -ub0 -c 192.168.99.1
Connecting to host 192.168.99.1, port 5201
[  5] local 192.168.99.0 port 19631 connected to 192.168.99.1 port 5201
[ ID] Interval           Transfer     Bitrate         Total Datagrams
[  5]   0.00-1.00   sec  1.11 GBytes  9.56 Gbits/sec  819173  
[  5]   1.00-2.00   sec  1.11 GBytes  9.57 Gbits/sec  819938  
[  5]   2.00-3.00   sec  1.11 GBytes  9.57 Gbits/sec  819165  
[  5]   3.00-4.00   sec  1.11 GBytes  9.57 Gbits/sec  819298  
[  5]   4.00-5.00   sec  1.11 GBytes  9.57 Gbits/sec  819118  
[  5]   5.00-6.00   sec  1.11 GBytes  9.57 Gbits/sec  818958  
[  5]   6.00-7.00   sec  1.11 GBytes  9.56 Gbits/sec  818553  
[  5]   7.00-8.00   sec  1.11 GBytes  9.57 Gbits/sec  819750  
[  5]   8.00-9.00   sec  1.11 GBytes  9.56 Gbits/sec  818532  
[  5]   9.00-10.00  sec  1.11 GBytes  9.58 Gbits/sec  819819  
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Jitter    Lost/Total
Datagrams
[  5]   0.00-10.00  sec  11.1 GBytes  9.57 Gbits/sec  0.000 ms  0/8192304 (0%) 
sender
[  5]   0.00-10.00  sec  11.1 GBytes  9.56 Gbits/sec  0.000 ms  743/8189808
(0.0091%)  receiver
```

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