cryo@smurf-srv10:~$ cat /proc/datadev_0
-------------- Axi Version ----------------
     Firmware Version : 0x101
           ScratchPad : 0x0
        Up Time Count : 1074
             Fd Value : 0x0000000000000000
            Device ID : 0x0
             Git Hash : 34962f449717309ab48676a83d27339eab7f92dc
            DNA Value : 0x0480000001d170cf69130c4100000000
         Build String : SmurfKcu1500RssiOffload10GbE: Vivado v2018.2, rdsrv222 (x86_64), Built Mon Apr 15 13:31:51 PDT 2019 by ruckman

-------------- General HW -----------------
          Int Req Count : 0
        Hw Dma Wr Index : 0
        Sw Dma Wr Index : 0
        Hw Dma Rd Index : 111
        Sw Dma Rd Index : 111
     Missed Wr Requests : 0
       Missed IRQ Count : 0
         Continue Count : 0
          Address Count : 4096
    Hw Write Buff Count : 3144
     Hw Read Buff Count : -111   <------ look here
           Cache Config : 0x0
            Desc 128 En : 0