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From: Pyun YongHyeon <yongari@FreeBSD.org>
Date: Fri, 24 Sep 2010 18:01:43 +0000 (UTC)
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X-FreeBSD-CVS-Branch: RELENG_7
Subject: cvs commit: src/sys/dev/bge if_bge.c if_bgereg.h
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yongari     2010-09-24 18:01:43 UTC

  FreeBSD src repository

  Modified files:        (Branch: RELENG_7)
    sys/dev/bge          if_bge.c if_bgereg.h 
  Log:
  SVN rev 213110 on 2010-09-24 18:01:43Z by yongari
  
  MFC r211596:
    It seems all Broadcom controllers have a bug that can generate UDP
    datagrams with checksum value 0 when TX UDP checksum offloading is
    enabled.  Generating UDP checksum value 0 is RFC 768 violation.
    Even though the probability of generating such UDP datagrams is
    low, I don't want to see FreeBSD boxes to inject such datagrams
    into network so disable UDP checksum offloading by default.  Users
    still override this behavior by setting a sysctl variable or loader
    tunable, dev.bge.%d.forced_udpcsum.
  
    I have no idea why this issue was not reported so far given that
    bge(4) is one of the most commonly used controller on high-end
    server class systems. Thanks to andre@ who passed the PR to me.
  
    PR:   kern/104826
  
  Revision    Changes    Path
  1.198.2.46  +41 -7     src/sys/dev/bge/if_bge.c
  1.73.2.21   +2 -0      src/sys/dev/bge/if_bgereg.h