s390/qeth: collect more TX statistics
Count the number of TX doorbells we issue to the qdio layer. Also count the number of actual frames in a TX buffer, and then use this data along with the byte count during TX completion. We'll make additional use of the frame count in a subsequent patch. Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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