What does "rx_errors" in Broadcom tg3 driver mean?

Issue

What does rx_errors in Broadcom tg3 driver mean?
Running ethtool -S eth0 shows rx_errors: 6
What are the common scenarios that would trigger this kind of rx_errors to help filter out the error source?

Red Hat Enterprise Linux 6
Broadcom Corporation NetXtreme BCM5719 Gigabit Ethernet (or similar) using tg3 driver
rx_errors counter in ethtool -S incremented

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