[dpdk-dev] [PATCH] net/enic: add support for Rx queue count function

[Nelson Escobar]

Add support to enic for rte_eth_rx_queue_count().

Signed-off-by: Nelson Escobar <neescoba at cisco.com>
Reviewed-by: John Daley <johndale at cisco.com>
---
 drivers/net/enic/enic_ethdev.c | 31 ++++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

diff --git a/drivers/net/enic/enic_ethdev.c b/drivers/net/enic/enic_ethdev.c
index 44105d6..d20637f 100644
--- a/drivers/net/enic/enic_ethdev.c
+++ b/drivers/net/enic/enic_ethdev.c
@@ -260,6 +260,35 @@ static void enicpmd_dev_rx_queue_release(void *rxq)
        enic_free_rq(rxq);
 }

+static uint32_t enicpmd_dev_rx_queue_count(struct rte_eth_dev *dev,
+                                          uint16_t rx_queue_id)
+{
+       struct enic *enic = pmd_priv(dev);
+       uint32_t queue_count = 0;
+       struct vnic_cq *cq;
+       uint32_t cq_tail;
+       uint16_t cq_idx;
+       int rq_num;
+
+       if (rx_queue_id >= dev->data->nb_rx_queues) {
+               dev_err(enic, "Invalid RX queue id=%d", rx_queue_id);
+               return 0;
+       }
+
+       rq_num = enic_sop_rq(rx_queue_id);
+       cq = &enic->cq[enic_cq_rq(enic, rq_num)];
+       cq_idx = cq->to_clean;
+
+       cq_tail = ioread32(&cq->ctrl->cq_tail);
+
+       if (cq_tail < cq_idx)
+               cq_tail += cq->ring.desc_count;
+
+       queue_count = cq_tail - cq_idx;
+
+       return queue_count;
+}
+
 static int enicpmd_dev_rx_queue_setup(struct rte_eth_dev *eth_dev,
        uint16_t queue_idx,
        uint16_t nb_desc,
@@ -560,7 +589,7 @@ static const struct eth_dev_ops enicpmd_eth_dev_ops = {
        .tx_queue_stop        = enicpmd_dev_tx_queue_stop,
        .rx_queue_setup       = enicpmd_dev_rx_queue_setup,
        .rx_queue_release     = enicpmd_dev_rx_queue_release,
-       .rx_queue_count       = NULL,
+       .rx_queue_count       = enicpmd_dev_rx_queue_count,
        .rx_descriptor_done   = NULL,
        .tx_queue_setup       = enicpmd_dev_tx_queue_setup,
        .tx_queue_release     = enicpmd_dev_tx_queue_release,
-- 
2.7.0