kern/112089: commit references a PR

dfilter service dfilter at FreeBSD.ORG
Sun Jun 3 07:50:12 UTC 2007

The following reply was made to PR kern/112089; it has been noted by GNATS.

From: dfilter at FreeBSD.ORG (dfilter service)
To: bug-followup at
Subject: Re: kern/112089: commit references a PR
Date: Sun,  3 Jun 2007 07:47:46 +0000 (UTC)

 yongari     2007-06-03 07:47:40 UTC
   FreeBSD src repository
   Modified files:        (Branch: RELENG_6)
     sys/dev/re           if_re.c 
   MFC if_re.c, 1.84 to RELENG_6
     The TCP checksum offload handling in the 8111B/8168B and 8101E PCIe can
     apparently be confused by short TCP segments that have been manually
     padded to the minimum ethernet frame size. The driver does short frame
     padding in software as a workaround for a bug in the 8169 PCI devices
     that causes short IP fragments to be corrupted due to an apparent
     conflict between the hardware autopadding and hardware IP checksumming.
     To fix this, we avoid software padding for short TCP segments, since
     the hardware seems to autopad and checksum these correctly (even the
     older 8169 NICs get these right). Short UDP packets appear to be
     handled correctly in all cases. This should work around the IP header
     checksum bug in the 8169 while not tripping the TCP checksum bug in
     the 8111B/8168B and 8101E.
   PR:     112089
   Revision   Changes    Path  +6 -1      src/sys/dev/re/if_re.c
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