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From: Pyun YongHyeon <yongari@FreeBSD.org>
Date: Wed, 11 Apr 2007 00:47:29 +0000 (UTC)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org
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Cc: 
Subject: cvs commit: src/sys/dev/msk if_msk.c
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yongari     2007-04-11 00:47:29 UTC

  FreeBSD src repository

  Modified files:
    sys/dev/msk          if_msk.c 
  Log:
  Add work around for hardware Tx checksum offload bug in Yukon II.
  Yukon II generated corrupted TCP checksum for short TCP packets
  that's less than 60 bytes in size(e.g. window probe packet, pure ACK
  packet etc). Padding the frame with zeros to make the frame minimum
  ethernet frame size didn't work at all. Instead of dropping Tx
  checksum offload support we calculate TCP checksum with S/W method
  when we encounter short TCP frames.
  Fortunately it seems that short UDP datagrams appear to be handled
  correctly by Yukon II.
  
  While I'm here simplify ethernet/VLAN header size calculation logic.
  
  PR:     111384
  
  Revision  Changes    Path
  1.13      +25 -5     src/sys/dev/msk/if_msk.c