cxgb4: Add FL DMA mapping error and low counter
Add Free List DMA Mapping Errors to SGE Queue info for Free Lists. Add Free List "Low" counter to count the number of times we see the number of pointers that we _think_ the hardware sees in the Free List below the Egress Threshold. Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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