[RFC,19/29] net/qdma: add callback function for Tx desc status
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Commit Message
This patch implements dev->tx_descriptor_status
function for net_qdma PMD.
Signed-off-by: Aman Kumar <aman.kumar@vvdntech.in>
---
drivers/net/qdma/qdma_devops.c | 1 +
drivers/net/qdma/qdma_rxtx.c | 47 ++++++++++++++++++++++++++++++++++
2 files changed, 48 insertions(+)
@@ -1759,4 +1759,5 @@ void qdma_dev_ops_init(struct rte_eth_dev *dev)
dev->tx_pkt_burst = &qdma_xmit_pkts;
dev->rx_queue_count = &qdma_dev_rx_queue_count;
dev->rx_descriptor_status = &qdma_dev_rx_descriptor_status;
+ dev->tx_descriptor_status = &qdma_dev_tx_descriptor_status;
}
@@ -559,6 +559,53 @@ qdma_dev_tx_done_cleanup(void *tx_queue, uint32_t free_cnt)
return reclaim_tx_mbuf(txq, txq->wb_status->cidx, free_cnt);
}
+/**
+ * DPDK callback to check the status of a Tx descriptor in the queue.
+ *
+ * @param tx_queue
+ * Pointer to Tx queue specific data structure.
+ * @param offset
+ * The offset of the descriptor starting from tail (0 is the place where
+ * the next packet will be send).
+ *
+ * @return
+ * - (RTE_ETH_TX_DESC_FULL) Descriptor is being processed by the hw, i.e.
+ * in the transmit queue.
+ * - (RTE_ETH_TX_DESC_DONE) Hardware is done with this descriptor, it can
+ * be reused by the driver.
+ * - (RTE_ETH_TX_DESC_UNAVAIL): Descriptor is unavailable, reserved by the
+ * driver or the hardware.
+ * - (-EINVAL) bad descriptor offset.
+ */
+int
+qdma_dev_tx_descriptor_status(void *tx_queue, uint16_t offset)
+{
+ struct qdma_tx_queue *txq = tx_queue;
+ uint16_t id;
+ int avail, in_use;
+ uint16_t cidx = 0;
+
+ if (unlikely(offset >= (txq->nb_tx_desc - 1)))
+ return -EINVAL;
+
+ /* One descriptor is reserved so that pidx is not same as old pidx */
+ if (offset == (txq->nb_tx_desc - 2))
+ return RTE_ETH_TX_DESC_UNAVAIL;
+
+ id = txq->q_pidx_info.pidx;
+ cidx = txq->wb_status->cidx;
+
+ in_use = (int)id - cidx;
+ if (in_use < 0)
+ in_use += (txq->nb_tx_desc - 1);
+ avail = txq->nb_tx_desc - 2 - in_use;
+
+ if (offset < avail)
+ return RTE_ETH_TX_DESC_DONE;
+
+ return RTE_ETH_TX_DESC_FULL;
+}
+
/* Transmit API for Streaming mode */
uint16_t qdma_xmit_pkts_st(struct qdma_tx_queue *txq, struct rte_mbuf **tx_pkts,
uint16_t nb_pkts)