b0caba1a13
Under interrupt mode, rx_descriptor_done is used as an indicator for applications to check if some number of packets are ready to be received. This patch enables this by checking used ring's local consumed idx with shared (with backend) idx. Signed-off-by: Jianfeng Tan <jianfeng.tan@intel.com> Tested-by: Lei Yao <lei.a.yao@intel.com> Acked-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>