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AdSchellevis thanks for this.  After reading this it makes sense.

The iflib_netmap_config message isn't an error, it's just trying to tell you how it initialised netmap.

https://github.com/freebsd/freebsd-src/blob/1bfdb812c786ac2607a82633f9c84a5d16f54079/sys/net/iflib.c#L847-L849

https://github.com/freebsd/freebsd-src/commit/21d0c01226eb979556d6d792ec58eb54012fbc24

Also reporting I rolled back suricata (opnsense-revert -r 21.7.5 suricata) and allowed more time to test, it has appeared to resolve my issue, I do continue to see those messages in dmesg.

https://forum.opnsense.org/index.php?topic=25750.15

It would appear these issues might be linked...  I will be keeping my eye on that one.

Unless I reverted incorrectly, which I don't think I did, I had rebooted for each change to ensure all services came back and played nicely together..... 

Initially, I was monitoring VLANs, which I know is a no go, but subsequently changed to monitor the parent interface in promiscuous mode.   

As of now, just monitoring interfaces in promiscuous mode is working, but I still get the iflib_netmap_config errors.  (Error:  iflib_netmap_config       txr 4 rxr 4 txd 1024 rxd 1024 rbufsz 2048)

Made the change, LibreSSL to OpenSSL, reboot and the same errors appears.  I get the same errors and eventually it stops routing. 

The only thing I have found that seems to work is not to have IDS/IPS running on interfaces with vlans.  I still get the errors iflib_netmap_config txr 4 rxr 4 txd 1024 rxd 1024 rbufsz 2048.  At this time I just run IDS/IPS on WAN and two other LAN interface with no vlans.

Recently updated to 21.7.6 from 21.7.5 and after doing so I am running into errors.  Initially my LAN would stop routing traffic and I started noticing errors in dmesg and on screen.  I also noticed the same errors when modifying IDS/IPS.  Which made me think it might be the new IDS/Suricata update causing the issue.

I am running:
OPNsense 21.7.6-amd64
FreeBSD 12.1-RELEASE-p21-HBSD
LibreSSL 3.3.5
CPU: AMD Ryzen 5 2400G
NICs: Intel I350-T4
RAM: 16GB

I noticed in dmesg the following:

generic_netmap_dtor        Emulated netmap adapter for igb0_vlan40 destroyed
generic_netmap_attach     Emulated adapter for igb0_vlan40 created (prev was NULL)
generic_netmap_register   Emulated adapter for igb0_vlan40 activated
iflib_netmap_config             txr 4 rxr 4 txd 1024 rxd 1024 rbufsz 2048

After doing some research I have tried a few things.

1. Revert back to 21.7.5 (issue still persisted)
2. Revert suricata (issue still persisted)
3. Revert os-etpro-telemetry (issue still persisted)
4. Reinstalled back to 21.7.6 and all updates.
4. Reinstalled Kernel (issue still persisted)
5. Tuned I350 Gigabit Nic with  (issue still persisted, removed settings):
     dev.igb.0.iflib.override_ntxds="4096"
     dev.igb.1.iflib.override_ntxds="4096"
     dev.igb.0.iflib.override_nrxds="4096"
     dev.igb.1.iflib.override_nrxds="4096"
6. Tried to ensure that intel drivers were loaded during boot with adding if_igb_load="YES" to /boot/loader.conf  (issue still persisted, kept setting)

After all that, the issue still persists, not sure what else to do at this point. Not much information on iflib_netmap_config....  Any suggestions?