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-SYSFS FILES
-
-  For each InfiniBand device, the InfiniBand drivers create the
-  following files under /sys/class/infiniband/<device name>:
-
-    node_type      - Node type (CA, switch or router)
-    node_guid      - Node GUID
-    sys_image_guid - System image GUID
-
-  In addition, there is a "ports" subdirectory, with one subdirectory
-  for each port.  For example, if mthca0 is a 2-port HCA, there will
-  be two directories:
-
-    /sys/class/infiniband/mthca0/ports/1
-    /sys/class/infiniband/mthca0/ports/2
-
-  (A switch will only have a single "0" subdirectory for switch port
-  0; no subdirectory is created for normal switch ports)
-
-  In each port subdirectory, the following files are created:
-
-    cap_mask       - Port capability mask
-    lid            - Port LID
-    lid_mask_count - Port LID mask count
-    rate           - Port data rate (active width * active speed)
-    sm_lid         - Subnet manager LID for port's subnet
-    sm_sl          - Subnet manager SL for port's subnet
-    state          - Port state (DOWN, INIT, ARMED, ACTIVE or ACTIVE_DEFER)
-    phys_state     - Port physical state (Sleep, Polling, LinkUp, etc)
-
-  There is also a "counters" subdirectory, with files
-
-    VL15_dropped
-    excessive_buffer_overrun_errors
-    link_downed
-    link_error_recovery
-    local_link_integrity_errors
-    port_rcv_constraint_errors
-    port_rcv_data
-    port_rcv_errors
-    port_rcv_packets
-    port_rcv_remote_physical_errors
-    port_rcv_switch_relay_errors
-    port_xmit_constraint_errors
-    port_xmit_data
-    port_xmit_discards
-    port_xmit_packets
-    symbol_error
-
-  Each of these files contains the corresponding value from the port's
-  Performance Management PortCounters attribute, as described in
-  section 16.1.3.5 of the InfiniBand Architecture Specification.
-
-  The "pkeys" and "gids" subdirectories contain one file for each
-  entry in the port's P_Key or GID table respectively.  For example,
-  ports/1/pkeys/10 contains the value at index 10 in port 1's P_Key
-  table.
-
-MTHCA
-
-  The Mellanox HCA driver also creates the files:
-
-    hw_rev   - Hardware revision number
-    fw_ver   - Firmware version
-    hca_type - HCA type: "MT23108", "MT25208 (MT23108 compat mode)",
-               or "MT25208"