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From: Pyun YongHyeon <yongari@FreeBSD.org>
Date: Sat, 15 Jan 2011 00:32:15 +0000 (UTC)
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Subject: cvs commit: src/sys/dev/re if_re.c
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yongari     2011-01-15 00:32:15 UTC

  FreeBSD src repository

  Modified files:        (Branch: RELENG_8)
    sys/dev/re           if_re.c 
  Log:
  SVN rev 217435 on 2011-01-15 00:32:15Z by yongari
  
  MFC r217296:
    For re(4) controllers that uses new jumbo frame scheme(RTL8168C/D/E),
    limit maximum RX buffer size to RE_RX_DESC_BUFLEN instead of
    blindly configuring it to 16KB. Due to lack of documentation, re(4)
    didn't allow jumbo frame on these controllers. However it seems
    controller is confused with jumbo frame such that it can DMA the
    received frame to wrong address instead of splitting it into
    multiple RX buffers. Of course, this caused panic.
  
    Since re(4) does not support jumbo frames on these controllers,
    make controller drop frame that is longer than RE_RX_DESC_BUFLEN
    sized frame. Fortunately RTL810x controllers, which do not support
    jumbo frame, have no such issues but this change also limited
    maximum RX buffer size allowed to RTL810x controllers. Allowing
    16KB RX buffer for controllers that have no such capability is
    meaningless.
  
  Revision    Changes    Path
  1.160.2.17  +7 -2      src/sys/dev/re/if_re.c