[Bug 258986] [ixgbe] sysctl stats don't report jumbo frames

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=258986

            Bug ID: 258986
           Summary: [ixgbe] sysctl stats don't report jumbo frames
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: asomers@FreeBSD.org

The ixgbe driver publishes a bunch of stats via the sysctl interface.  Among
them are a histogram of the sent and received frame sizes.  However, this
histogram ends at 1522 bytes.  For example:

# sysctl dev.ix.0 | grep x_frame
dev.ix.0.mac_stats.tx_frames_1024_1522: 102041616251
dev.ix.0.mac_stats.tx_frames_512_1023: 918277489
dev.ix.0.mac_stats.tx_frames_256_511: 1797068858
dev.ix.0.mac_stats.tx_frames_128_255: 1826567947
dev.ix.0.mac_stats.tx_frames_65_127: 10586619068
dev.ix.0.mac_stats.tx_frames_64: 1407126
dev.ix.0.mac_stats.rx_frames_1024_1522: 114257985091
dev.ix.0.mac_stats.rx_frames_512_1023: 1442145561
dev.ix.0.mac_stats.rx_frames_256_511: 2456033440
dev.ix.0.mac_stats.rx_frames_128_255: 624033055
dev.ix.0.mac_stats.rx_frames_65_127: 24790890291
dev.ix.0.mac_stats.rx_frames_64: 12574573

On this particular system, I am sending and receiving jumbo frames, as
confirmed by netstat:

# netstat -I ix0 1 | awk '$1 ~ /[1-9]/ {print ("bytes/packet tx:", $4 / $1,
"bytes/packet rx:", $7 /  $5)}'
bytes/packet tx: 1270.04 bytes/packet rx: 1229.77
bytes/packet tx: 1322.84 bytes/packet rx: 874.726
bytes/packet tx: 2240 bytes/packet rx: 1062.68
bytes/packet tx: 2128.77 bytes/packet rx: 1106.72
bytes/packet tx: 1174.64 bytes/packet rx: 1346.54

Ideally the sysctl stats would have at least one more bin for > 1522 bytes.

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