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Date:      Thu, 14 Apr 2016 15:35:09 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-bugs@FreeBSD.org
Subject:   [Bug 208803] ixgbe(4) reports wrong IPv4 checksum when txcsum is enabled
Message-ID:  <bug-208803-8@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D208803

            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@FreeBSD.org
          Reporter: n+freebsd@nirf.de
                CC: freebsd-amd64@FreeBSD.org
                CC: freebsd-amd64@FreeBSD.org

I've got Silicom 10G Ethernet cards, which use the ixgbe(4) driver. When tx=
csum
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 cor=
rect
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@pci0:12:0:0:        class=3D0x020000 card=3D0xa05f8086 chip=3D0x10c7808=
6 rev=3D0x01
hdr=3D0x00
    vendor     =3D 'Intel Corporation'
    device     =3D '82598EB 10-Gigabit AF Network Connection'
    class      =3D network
    subclass   =3D ethernet

--=20
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