[dpdk-dev] When I run test-pmd, most of received packets(loop-backed packet) have RX-error.

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Dear DPDK experts.
 
Thank you very much for your best great efforts and precious answers.
 
 
When I run test-pmd, most of received packets are RX-error.
 
The computer has two 10GbE ports Intel NIC and the two ports are loop-backed each other.
 
The result shows that the loop-backed packets have rx-error occured from ethernet device port.
 
The rx-error ( ierrors) seems to be counted by rte_eth_stats_get(uint8_t port_id, struct rte_eth_stats *stats) function in ~/dpdk/lib/librte_ether/rte_ethdev.c
 
Then this rte_eth_stats_get() function calls (*dev->dev_ops->stats_get)(dev, stats);
 
However, I can't find and trace the function (*dev->dev_ops->stats_get)().
 
Would you tell me how can I find the function?
 
Would you tell me why this receive errors occurs for what reasons?
 
 
I tested it in two xeon computers with different OS.
 
   Fedora 22 (linux kernel version 4.2.3-200.fc22.x86_64, DPDK 2.1.0).
   Ubuntu 14.04.1 LTS(linux kernel version : 3.13.0-34-generic, DPDK 2.1.0).  
 
Both experiments show the same result with rx-errors.
 
I will really appreciate if I can be given any advice and answers.
 
Thank you very much.
 
Sincerely Yours,
 
Ick-Sung Choi.