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From: Navdeep Parhar <np@FreeBSD.org>
Date: Sat, 12 Jun 2010 22:33:04 +0000 (UTC)
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Subject: cvs commit: src/sys/dev/cxgb cxgb_adapter.h cxgb_sge.c
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np          2010-06-12 22:33:04 UTC

  FreeBSD src repository

  Modified files:
    sys/dev/cxgb         cxgb_adapter.h cxgb_sge.c 
  Log:
  SVN rev 209116 on 2010-06-12 22:33:04Z by np
  
  cxgb(4): add knob to get packet timestamps from the hardware.
  
  The T3 ASIC can provide an incoming packet's timestamp instead of its RSS hash.
  The timestamp is just a counter running off the card's clock.  With a 175MHz
  clock an increment represents ~5.7ns and the 32 bit value wraps around in ~25s.
  
  # sysctl -d dev.cxgbc.0.pkt_timestamp
  dev.cxgbc.0.pkt_timestamp: provide packet timestamp instead of connection hash
  
  # sysctl -d dev.cxgbc.0.core_clock
  dev.cxgbc.0.core_clock: core clock frequency (in KHz)
  # sysctl dev.cxgbc.0.core_clock
  dev.cxgbc.0.core_clock: 175000
  
  Revision  Changes    Path
  1.55      +2 -0      src/sys/dev/cxgb/cxgb_adapter.h
  1.91      +51 -16    src/sys/dev/cxgb/cxgb_sge.c