igb: check DD bit of specific RX descriptor

[dpdk.git] / lib / librte_pmd_e1000 / em_rxtx.c

diff --git a/lib/librte_pmd_e1000/em_rxtx.c b/lib/librte_pmd_e1000/em_rxtx.c
index a6b2acd..eb00b0c 100644 (file)
--- a/lib/librte_pmd_e1000/em_rxtx.c
+++ b/lib/librte_pmd_e1000/em_rxtx.c
@@ -1445,6 +1445,23 @@ eth_em_rx_queue_count(struct rte_eth_dev *dev, uint16_t rx_queue_id)
        return desc;
 }
 
+int
+eth_em_rx_descriptor_done(void *rx_queue, uint16_t offset)
+{
+       volatile struct e1000_rx_desc *rxdp;
+       struct em_rx_queue *rxq = rx_queue;
+       uint16_t desc;
+
+       if (unlikely(offset >= rxq->nb_rx_desc))
+               return 0;
+       desc = rxq->rx_tail + offset;
+       if (desc >= rxq->nb_rx_desc)
+               desc -= rxq->nb_rx_desc;
+
+       rxdp = &rxq->rx_ring[desc];
+       return !!(rxdp->status & E1000_RXD_STAT_DD);
+}
+
 void
 em_dev_clear_queues(struct rte_eth_dev *dev)
 {