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From: Juli Mallett <jmallett@FreeBSD.org>
Date: Mon, 29 Nov 2010 21:04:00 +0000 (UTC)
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Subject: cvs commit: src/sys/mips/cavium/octe ethernet-tx.c
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jmallett    2010-11-29 21:04:00 UTC

  FreeBSD src repository

  Modified files:
    sys/mips/cavium/octe ethernet-tx.c 
  Log:
  SVN rev 216064 on 2010-11-29 21:04:00Z by jmallett
  
  Don't free the work queue entry that we're using to hold the scatter-gather
  list on exit from the transmit path.  The scatter-gather list itself can be
  asynchronously DMAed to the transmit hardware, and we could actually lock up
  the transmitter if any of a number of races around this were lost.
  
  Instead, let the PKO free the scatter-gather list when it is done with it, and
  use the "i" bit in each segment of the packet to avoid having them go into the
  FPA.
  
  This fixes an unrecoverable transmit stall under transmit load.
  
  MFC after:      3 days
  
  Revision  Changes    Path
  1.4       +8 -4      src/sys/mips/cavium/octe/ethernet-tx.c