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From: Pyun YongHyeon <yongari@FreeBSD.org>
Date: Sun, 27 Mar 2011 22:37:28 +0000 (UTC)
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X-FreeBSD-CVS-Branch: RELENG_7
Subject: cvs commit: src/sys/dev/dc if_dc.c
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yongari     2011-03-27 22:37:28 UTC

  FreeBSD src repository

  Modified files:        (Branch: RELENG_7)
    sys/dev/dc           if_dc.c 
  Log:
  SVN rev 220071 on 2011-03-27 22:37:28Z by yongari
  
  MFC r218830-218831:
  r218830:
    Send frames only when there is a valid link and driver is running
    as well as controller has enough free TX descriptors.
    Remove check for number of queued frames before attempting to
    transmit. I guess it was added to allow draining queued frames
    even if there is no link. I'm under the impression this type of
    check should be done in upper layer. No other drivers in tree do
    that.
  
  r218831:
    Rearrange interrupt handler a bit and remove forever loop.
    Previously dc(4) always checked whether there is pending interrupts
    and this consumed a lot of CPU cycles in interrupt handler. Limit
    the number of processing for TX/RX frames to 16. Also allow sending
    frames in the loop not to starve TX under high RX load.
    Reading DC_ISR register should be protected with driver lock,
    otherwise interrupt handler could be run(e.g. link state change)
    before the completion of dc_init_locked().
  
    While I'm here remove unneeded code.
  
  Revision    Changes    Path
  1.192.2.12  +22 -26    src/sys/dev/dc/if_dc.c