ixgbe: Limit SFP polling rate
Reduce the frequency of polling for SFP modules. Because the service task sometimes runs at high rates, we can poll for SFPs too often. When an SFP is not present, the I2C timeouts that result are very costly. So, prevent SFP polling from being done more than once every two seconds. To reduce latency, the poll time is cleared in a couple of cases to permit the next service task execution to poll the SFP module. Signed-off-by: NMark Rustad <mark.d.rustad@intel.com> Tested-by: NPhil Schmitt <phillip.j.schmitt@intel.com> Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>
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