igb: Add timeout for PTP Tx work item
When transmitting a packet that must return a Tx timestamp, a work item gets scheduled to poll for the Tx timestamp being completed in hardware. Add a timeout on this work item of 15 seconds from when the driver gets the skb, after which it will stop polling. Report via stats and system log if this occurs. Cc: Richard Cochran <richardcochran@gmail.com> Signed-off-by: NMatthew Vick <matthew.vick@intel.com> Acked-by: NJacob Keller <Jacob.e.keller@intel.com> Tested-by: NAaron Brown <aaron.f.brown@intel.com> Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>
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