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As driver flag of 'RTE_PCI_DRV_INTR_LSC' was introduced recently, it must be added in i40e. One second waiting is needed for link up event, to wait the hardware into a stable state, so the interrupt could be processed in two parts. In addition, it should finally call the callback function registered by application. Test: http://dpdk.org/ml/archives/dev/2014-September/006091.html Signed-off-by: Helin Zhang <helin.zhang@intel.com> Reviewed-by: Jing Chen <jing.d.chen@intel.com> Reviewed-by: Jijiang Liu <jijiang.liu@intel.com> Tested-by: Min Cao <min.cao@intel.com>