1. 26 6月, 2016 2 次提交
    • H
      cxgb4vf: Synchronize access to mailbox · b38066da
      Hariprasad Shenai 提交于
      The issue comes when there are multiple threads attempting to use the
      mailbox facility at the same time. The issue is the for the Virtual
      Function Driver, the only way to get the Virtual Interface statistics
      is to issue mailbox commands to ask the firmware for the VI Stats.
      And, because the VI Stats command can only retrieve a smallish number of
      stats per mailbox command, we have to issue three mailbox commands in quick
      succession. When ethtool or netstat command to get interface stats and
      interface up/down is run in a loop for every 0.1 sec, we observed
      mailbox collisions. And out of the two commands one would fail with
      the present code, since we don't queue the second command.
      
      To overcome the above issue, added a queue to access the mailbox.
      Whenever a mailbox command is issued add it to the queue. If its at the
      head issue the mailbox command, else wait for the existing command to
      complete. Usually command takes less than a milli-second to complete.
      Also timeout from the loop, if the command under execution takes
      long time to run.
      
      In reality, the number of mailbox access collisions is going to be very
      rare since no one runs such abusive script.
      Signed-off-by: NHariprasad Shenai <hariprasad@chelsio.com>
      Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      b38066da
    • W
      eb88d585
  2. 25 6月, 2016 6 次提交
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