[dpdk-dev] [PATCH v5 1/6] fm10k: implement rx_descriptor_done function

[Shaopeng He]

rx_descriptor_done is used by interrupt mode example application
(l3fwd-power) to check rxd DD bit to decide the RX trend,
then l3fwd-power will adjust the cpu frequency according to
the result.

v5 change:
  - fix a wrong error message

Signed-off-by: Shaopeng He <shaopeng.he at intel.com>
---
 drivers/net/fm10k/fm10k.h        |  3 +++
 drivers/net/fm10k/fm10k_ethdev.c |  1 +
 drivers/net/fm10k/fm10k_rxtx.c   | 25 +++++++++++++++++++++++++
 3 files changed, 29 insertions(+)

diff --git a/drivers/net/fm10k/fm10k.h b/drivers/net/fm10k/fm10k.h
index cd38af2..e2f677a 100644
--- a/drivers/net/fm10k/fm10k.h
+++ b/drivers/net/fm10k/fm10k.h
@@ -345,6 +345,9 @@ uint16_t fm10k_recv_pkts(void *rx_queue, struct rte_mbuf 
**rx_pkts,
 uint16_t fm10k_recv_scattered_pkts(void *rx_queue,
                struct rte_mbuf **rx_pkts, uint16_t nb_pkts);

+int
+fm10k_dev_rx_descriptor_done(void *rx_queue, uint16_t offset);
+
 uint16_t fm10k_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
        uint16_t nb_pkts);

diff --git a/drivers/net/fm10k/fm10k_ethdev.c b/drivers/net/fm10k/fm10k_ethdev.c
index e4aed94..d39c33b 100644
--- a/drivers/net/fm10k/fm10k_ethdev.c
+++ b/drivers/net/fm10k/fm10k_ethdev.c
@@ -2435,6 +2435,7 @@ static const struct eth_dev_ops fm10k_eth_dev_ops = {
        .rx_queue_release       = fm10k_rx_queue_release,
        .tx_queue_setup         = fm10k_tx_queue_setup,
        .tx_queue_release       = fm10k_tx_queue_release,
+       .rx_descriptor_done     = fm10k_dev_rx_descriptor_done,
        .reta_update            = fm10k_reta_update,
        .reta_query             = fm10k_reta_query,
        .rss_hash_update        = fm10k_rss_hash_update,
diff --git a/drivers/net/fm10k/fm10k_rxtx.c b/drivers/net/fm10k/fm10k_rxtx.c
index e958865..0002f09 100644
--- a/drivers/net/fm10k/fm10k_rxtx.c
+++ b/drivers/net/fm10k/fm10k_rxtx.c
@@ -369,6 +369,31 @@ fm10k_recv_scattered_pkts(void *rx_queue, struct rte_mbuf 
**rx_pkts,
        return nb_rcv;
 }

+int
+fm10k_dev_rx_descriptor_done(void *rx_queue, uint16_t offset)
+{
+       volatile union fm10k_rx_desc *rxdp;
+       struct fm10k_rx_queue *rxq = rx_queue;
+       uint16_t desc;
+       int ret;
+
+       if (unlikely(offset >= rxq->nb_desc)) {
+               PMD_DRV_LOG(ERR, "Invalid RX descriptor offset %u", offset);
+               return 0;
+       }
+
+       desc = rxq->next_dd + offset;
+       if (desc >= rxq->nb_desc)
+               desc -= rxq->nb_desc;
+
+       rxdp = &rxq->hw_ring[desc];
+
+       ret = !!(rxdp->w.status &
+                       rte_cpu_to_le_16(FM10K_RXD_STATUS_DD));
+
+       return ret;
+}
+
 static inline void tx_free_descriptors(struct fm10k_tx_queue *q)
 {
        uint16_t next_rs, count = 0;
-- 
1.9.3