net/hns3: get number of used descriptors of Rx queue

Implement the available and used rxd number count function.

In Kunpeng series, the NIC hardware supports to read the bd numbers
which wait processed from the hardware FBD (Full Buffer Descriptor),
and the driver maintains the bd number to be written back hardware.
Compare the number of FBDs with the number of BDs to be written back to
the hardware.

The number of used descriptors of a rx queue is computed as follows:
The fbd numbers of reading from FBD register plus the bd numbers to be
written back to hardware maintained by the driver.

Signed-off-by: Lijun Ou <oulijun@huawei.com>

diff --git a/drivers/net/hns3/hns3_ethdev.c b/drivers/net/hns3/hns3_ethdev.c
index c34dbea..6342c70 100644 (file)
--- a/drivers/net/hns3/hns3_ethdev.c
+++ b/drivers/net/hns3/hns3_ethdev.c
@@ -6096,6 +6096,7 @@ hns3_dev_init(struct rte_eth_dev *eth_dev)
 
        hns3_set_rxtx_function(eth_dev);
        eth_dev->dev_ops = &hns3_eth_dev_ops;
+       eth_dev->rx_queue_count = hns3_rx_queue_count;
        if (rte_eal_process_type() != RTE_PROC_PRIMARY) {
                ret = hns3_mp_init_secondary();
                if (ret) {

diff --git a/drivers/net/hns3/hns3_ethdev_vf.c b/drivers/net/hns3/hns3_ethdev_vf.c
index 7d3750d..9fb7941 100644 (file)
--- a/drivers/net/hns3/hns3_ethdev_vf.c
+++ b/drivers/net/hns3/hns3_ethdev_vf.c
@@ -2743,6 +2743,7 @@ hns3vf_dev_init(struct rte_eth_dev *eth_dev)
 
        hns3_set_rxtx_function(eth_dev);
        eth_dev->dev_ops = &hns3vf_eth_dev_ops;
+       eth_dev->rx_queue_count = hns3_rx_queue_count;
        if (rte_eal_process_type() != RTE_PROC_PRIMARY) {
                ret = hns3_mp_init_secondary();
                if (ret) {

diff --git a/drivers/net/hns3/hns3_rxtx.c b/drivers/net/hns3/hns3_rxtx.c
index d511908..55bee17 100644 (file)
--- a/drivers/net/hns3/hns3_rxtx.c
+++ b/drivers/net/hns3/hns3_rxtx.c
@@ -3823,3 +3823,28 @@ hns3_dev_tx_queue_stop(struct rte_eth_dev *dev, uint16_t tx_queue_id)
 
        return 0;
 }
+
+uint32_t
+hns3_rx_queue_count(struct rte_eth_dev *dev, uint16_t rx_queue_id)
+{
+       /*
+        * Number of BDs that have been processed by the driver
+        * but have not been notified to the hardware.
+        */
+       uint32_t driver_hold_bd_num;
+       struct hns3_rx_queue *rxq;
+       uint32_t fbd_num;
+
+       rxq = dev->data->rx_queues[rx_queue_id];
+       fbd_num = hns3_read_dev(rxq, HNS3_RING_RX_FBDNUM_REG);
+       if (dev->rx_pkt_burst == hns3_recv_pkts_vec ||
+           dev->rx_pkt_burst == hns3_recv_pkts_vec_sve)
+               driver_hold_bd_num = rxq->rx_rearm_nb;
+       else
+               driver_hold_bd_num = rxq->rx_free_hold;
+
+       if (fbd_num <= driver_hold_bd_num)
+               return 0;
+       else
+               return fbd_num - driver_hold_bd_num;
+}

diff --git a/drivers/net/hns3/hns3_rxtx.h b/drivers/net/hns3/hns3_rxtx.h
index 4be9c4a..ae09e94 100644 (file)
--- a/drivers/net/hns3/hns3_rxtx.h
+++ b/drivers/net/hns3/hns3_rxtx.h
@@ -620,6 +620,7 @@ int hns3_rx_queue_setup(struct rte_eth_dev *dev, uint16_t idx, uint16_t nb_desc,
                        struct rte_mempool *mp);
 int hns3_tx_queue_setup(struct rte_eth_dev *dev, uint16_t idx, uint16_t nb_desc,
                        unsigned int socket, const struct rte_eth_txconf *conf);
+uint32_t hns3_rx_queue_count(struct rte_eth_dev *dev, uint16_t rx_queue_id);
 int hns3_dev_rx_queue_start(struct rte_eth_dev *dev, uint16_t rx_queue_id);
 int hns3_dev_rx_queue_stop(struct rte_eth_dev *dev, uint16_t rx_queue_id);
 int hns3_dev_tx_queue_start(struct rte_eth_dev *dev, uint16_t tx_queue_id);