[Bug 208803] ixgbe(4) reports wrong IPv4 checksum when txcsum is enabled

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208803

            Bug ID: 208803
           Summary: ixgbe(4) reports wrong IPv4 checksum when txcsum is
                    enabled
           Product: Base System
           Version: 10.3-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: n+freebsd at nirf.de
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

I've got Silicom 10G Ethernet cards, which use the ixgbe(4) driver. When txcsum
is enabled, outgoing IPv4 packets show up in tcpdump on the sending host as
having a wrong checksum. However the packets appear to be sent with the correct
checksum. On the receiving host, no checksum errors are detected.

I've tested this with multiple different cards (single port and dual port) on
different machines. pciconf shows them as:

ix0 at pci0:12:0:0:        class=0x020000 card=0xa05f8086 chip=0x10c78086 rev=0x01
hdr=0x00
    vendor     = 'Intel Corporation'
    device     = '82598EB 10-Gigabit AF Network Connection'
    class      = network
    subclass   = ethernet

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