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Add the following per-port sysfs traffic counters for RoCE:

        port_xmit_packets
        port_rcv_packets
        port_rcv_data
        port_xmit_data
Signed-off-by: Mitesh Ahuja <mitesh.ahuja@emulex.com>
Signed-off-by: Devesh Sharma <devesh.sharma@emulex.com>
Signed-off-by: Selvin Xavier <selvin.xavier@emulex.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>