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Sean Bruno authored
applying them to em(4). Rely on iterations through the local timer, and the tx queue state to determine if an actual hang has occurred. Any time a descriptor is used (packet sent), the tx queue is flagged as busy. Then when txeof runs, it either clears the flag when all is clean, or resets it to 1 if ANY are cleaned, if nothing is cleaned it increments the flag. Local timer simply checks to see if busy ever reaches MAX (10, which is compile time configurable), and then sets it as HUNG, at that point there is one more timer cycle in which to have any cleans, if not a watchdog reset will occur. Differential Revision: https://reviews.freebsd.org/D2019 Submitted by: jfv Reviewed by: hiren Obtained from: Intel Corporation MFC after: 2 weeks Relnotes: Yes Sponsored by: Limelight Networks
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