Flow Director statistics for ixgbe(4)

[Takuya ASADA]

Hi,

This is originally part of "ixgbetool" patch, but I think it can be discuss
separately:
http://freebsd.1045724.n5.nabble.com/Adding-Flow-Director-sysctls-to-ixgbe-4-was-netmap-traffic-distribution-tp5847066p5847789.html

I implemented sysctls to expose Flow Director statistics.
It works like this:
$ sysctl dev.ix.0.mac_stats|grep fdir
dev.ix.0.mac_stats.fdirfree_free: 8192
dev.ix.0.mac_stats.fdirfree_coll: 0
dev.ix.0.mac_stats.fdirustat_add: 0
dev.ix.0.mac_stats.fdirustat_remove: 0
dev.ix.0.mac_stats.fdirfstat_fadd: 0
dev.ix.0.mac_stats.fdirfstat_fremove: 0
dev.ix.0.mac_stats.fdirmatch: 0
dev.ix.0.mac_stats.fdirmiss: 23
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