IB/core: Add link layer type information to sysfs
Since an IB transport port may use either IB or Ethernet as its link layer, add the file /sys/class/infiniband/<device>/ports/<port_num>/link_layer to show the link layer for the port. Signed-off-by: NEli Cohen <eli@mellanox.co.il> Signed-off-by: NRoland Dreier <rolandd@cisco.com>
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