net/e1000: implement descriptor status API

[dpdk.git] / drivers / net / e1000 / em_rxtx.c

diff --git a/drivers/net/e1000/em_rxtx.c b/drivers/net/e1000/em_rxtx.c
index a265cb4..31819c5 100644 (file)
--- a/drivers/net/e1000/em_rxtx.c
+++ b/drivers/net/e1000/em_rxtx.c
@@ -1468,6 +1468,57 @@ eth_em_rx_descriptor_done(void *rx_queue, uint16_t offset)
        return !!(rxdp->status & E1000_RXD_STAT_DD);
 }
 
+int
+eth_em_rx_descriptor_status(void *rx_queue, uint16_t offset)
+{
+       struct em_rx_queue *rxq = rx_queue;
+       volatile uint8_t *status;
+       uint32_t desc;
+
+       if (unlikely(offset >= rxq->nb_rx_desc))
+               return -EINVAL;
+
+       if (offset >= rxq->nb_rx_desc - rxq->nb_rx_hold)
+               return RTE_ETH_RX_DESC_UNAVAIL;
+
+       desc = rxq->rx_tail + offset;
+       if (desc >= rxq->nb_rx_desc)
+               desc -= rxq->nb_rx_desc;
+
+       status = &rxq->rx_ring[desc].status;
+       if (*status & E1000_RXD_STAT_DD)
+               return RTE_ETH_RX_DESC_DONE;
+
+       return RTE_ETH_RX_DESC_AVAIL;
+}
+
+int
+eth_em_tx_descriptor_status(void *tx_queue, uint16_t offset)
+{
+       struct em_tx_queue *txq = tx_queue;
+       volatile uint8_t *status;
+       uint32_t desc;
+
+       if (unlikely(offset >= txq->nb_tx_desc))
+               return -EINVAL;
+
+       desc = txq->tx_tail + offset;
+       /* go to next desc that has the RS bit */
+       desc = ((desc + txq->tx_rs_thresh - 1) / txq->tx_rs_thresh) *
+               txq->tx_rs_thresh;
+       if (desc >= txq->nb_tx_desc) {
+               desc -= txq->nb_tx_desc;
+               if (desc >= txq->nb_tx_desc)
+                       desc -= txq->nb_tx_desc;
+       }
+
+       status = &txq->tx_ring[desc].upper.fields.status;
+       if (*status & E1000_TXD_STAT_DD)
+               return RTE_ETH_TX_DESC_DONE;
+
+       return RTE_ETH_TX_DESC_FULL;
+}
+
 void
 em_dev_clear_queues(struct rte_eth_dev *dev)
 {