[Bug 280386] if_bridge throws output errors under load

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280386

--- Comment #3 from Zhenlei Huang <zlei@FreeBSD.org> ---
(In reply to pascal.guitierrez from comment #2)
Emm, igb(4) has been converted to use iflib(4). It seems that the iflib
implementation does not report statistics of output dropped packets (
IFCOUNTER_OQDROPS ).

May you please have a look at the driver statistics report from sysctl ? I do
not have igb(4) devices but have em(4) which use the same driver e1000 with
igb(4). For em(4) the statistics report for dropped packets are 
```
# sysctl dev.em.0.iflib | grep r_drops
dev.em.0.iflib.txq0.r_drops: 8402780
```

For igb(4) I guess they should be
```
# sysctl dev.igb.0.iflib | grep r_drops
```

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