K 10
svn:author
V 7
yongari
K 8
svn:date
V 27
2008-04-22T06:09:57.000000Z
K 7
svn:log
V 763
MFC if_re.c 1.112 to RELENG_7.
  In revision 1.70, 1.71 and 1.84 re(4) tried to workaround checksum
  offload bugs by manual padding for short IP/UDP frames. Unfortunately
  it seems that these workaround does not work reliably on newer PCIe
  variants of RealTek chips.

  To workaround the hardware bug, always pad short frames if Tx IP
  checksum offload is requested. It seems that the hardware has a
  bug in IP checksum offload handling. NetBSD manually pads short
  frames only when the length of IP frame is less than 28 bytes but I
  chose 60 bytes to safety. Also unconditionally set IP checksum
  offload bit in Tx descriptor if any TCP or UDP checksum offload is
  requested. This is the same way as Linux does but it's not
  mentioned in data sheet.

END