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infiniband
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ipoib.txt

ipoib.txt 2.2 KB
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  1. IP OVER INFINIBAND
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  2. 

  3.   The ib_ipoib driver is an implementation of the IP over InfiniBand
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  4.   protocol as specified by RFC 4391 and 4392, issued by the IETF ipoib
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  5.   working group.  It is a "native" implementation in the sense of
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  6.   setting the interface type to ARPHRD_INFINIBAND and the hardware
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  7.   address length to 20 (earlier proprietary implementations
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  8.   masqueraded to the kernel as ethernet interfaces).
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  9. 

  10. Partitions and P_Keys
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  11. 

  12.   When the IPoIB driver is loaded, it creates one interface for each
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  13.   port using the P_Key at index 0.  To create an interface with a
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  14.   different P_Key, write the desired P_Key into the main interface's
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  15.   /sys/class/net/<intf name>/create_child file.  For example:
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  16. 

  17.     echo 0x8001 > /sys/class/net/ib0/create_child
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  18. 

  19.   This will create an interface named ib0.8001 with P_Key 0x8001.  To
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  20.   remove a subinterface, use the "delete_child" file:
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  21. 

  22.     echo 0x8001 > /sys/class/net/ib0/delete_child
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  23. 

  24.   The P_Key for any interface is given by the "pkey" file, and the
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  25.   main interface for a subinterface is in "parent."
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  26. 

  27. Debugging Information
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  28. 

  29.   By compiling the IPoIB driver with CONFIG_INFINIBAND_IPOIB_DEBUG set
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  30.   to 'y', tracing messages are compiled into the driver.  They are
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  31.   turned on by setting the module parameters debug_level and
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  32.   mcast_debug_level to 1.  These parameters can be controlled at
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  33.   runtime through files in /sys/module/ib_ipoib/.
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  34. 

  35.   CONFIG_INFINIBAND_IPOIB_DEBUG also enables files in the debugfs
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  36.   virtual filesystem.  By mounting this filesystem, for example with
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  37. 

  38.     mount -t debugfs none /sys/kernel/debug
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  39. 

  40.   it is possible to get statistics about multicast groups from the
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  41.   files /sys/kernel/debug/ipoib/ib0_mcg and so on.
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  42. 

  43.   The performance impact of this option is negligible, so it
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  44.   is safe to enable this option with debug_level set to 0 for normal
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  45.   operation.
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  46. 

  47.   CONFIG_INFINIBAND_IPOIB_DEBUG_DATA enables even more debug output in
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  48.   the data path when data_debug_level is set to 1.  However, even with
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  49.   the output disabled, enabling this configuration option will affect
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  50.   performance, because it adds tests to the fast path.
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  51. 

  52. References
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  53. 

  54.   Transmission of IP over InfiniBand (IPoIB) (RFC 4391)
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  55.     http://ietf.org/rfc/rfc4391.txt 
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  56.   IP over InfiniBand (IPoIB) Architecture (RFC 4392)
    57. 

  57.     http://ietf.org/rfc/rfc4392.txt 
    58.