1. 18 Apr, 2015 5 commits
  2. 09 Aug, 2014 1 commit
    • Stephen Warren's avatar
      net: BOOTP retry timeout improvements · f59be6e8
      Stephen Warren authored
      Currently, the BOOTP code sends out its initial request as soon as the
      Ethernet driver indicates "link up". If this packet is lost or not
      replied to for some reason, the code waits for a 1s timeout before
      retrying. For some reason, such early packets are often lost on my
      system, so this causes an annoying delay.
      
      To optimize this, modify the BOOTP code to have very short timeouts for
      the first packet transmitted, but gradually increase the timeout each
      time a timeout occurs. This way, if the first packet is lost, the second
      packet is transmitted quite quickly and hence the overall delay is low.
      However, if there's still no response, we don't keep spewing out packets
      at an insane speed.
      
      It's arguably more correct to try and find out why the first packet is
      lost. However, it seems to disappear inside my Ethenet chip; the TX chip
      indicates no error during TX (not that it has much in the way of
      reporting...), yet wireshark on the RX side doesn't see any packet.
      FWIW, I'm using an ASIX USB Ethernet adapter. Perhaps "link up" is
      reported too early or based on the wrong condition in HW, and we should
      add some fixed extra delay into the driver. However, this would slow down
      every link up event even if it ends up not being needed in some cases.
      Having BOOTP retry quickly applies the fix/WAR to every possible
      Ethernet device, and is quite simple to implement, so seems a better
      solution.
      Signed-off-by: default avatarStephen Warren <swarren@nvidia.com>
      Acked-by: default avatarJoe Hershberger <joe.hershberger@ni.com>
      f59be6e8
  3. 23 May, 2012 3 commits
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  10. 20 Jul, 2002 1 commit