Add a function to check DD bit status, and use it everywhere we do these
checks.

Signed-off-by: Anatoly Burakov <anatoly.bura...@intel.com>
---

Notes:
    v6:
    - Move ixgbe_tx_desc_done() to ixgbe_rxtx.h to avoid compile errors on
      platforms that do not support vector driver
    
    v5:
    - Add this commit

 drivers/net/intel/ixgbe/ixgbe_rxtx.c          |  8 ++-----
 drivers/net/intel/ixgbe/ixgbe_rxtx.h          | 21 +++++++++++++++++++
 .../net/intel/ixgbe/ixgbe_rxtx_vec_common.c   |  4 +---
 .../net/intel/ixgbe/ixgbe_rxtx_vec_common.h   |  4 +---
 4 files changed, 25 insertions(+), 12 deletions(-)

diff --git a/drivers/net/intel/ixgbe/ixgbe_rxtx.c 
b/drivers/net/intel/ixgbe/ixgbe_rxtx.c
index cdf0d33955..f32c2be988 100644
--- a/drivers/net/intel/ixgbe/ixgbe_rxtx.c
+++ b/drivers/net/intel/ixgbe/ixgbe_rxtx.c
@@ -118,13 +118,11 @@ static __rte_always_inline int
 ixgbe_tx_free_bufs(struct ci_tx_queue *txq)
 {
        struct ci_tx_entry *txep;
-       uint32_t status;
        int i, nb_free = 0;
        struct rte_mbuf *m, *free[RTE_IXGBE_TX_MAX_FREE_BUF_SZ];
 
        /* check DD bit on threshold descriptor */
-       status = txq->ixgbe_tx_ring[txq->tx_next_dd].wb.status;
-       if (!(status & rte_cpu_to_le_32(IXGBE_ADVTXD_STAT_DD)))
+       if (!ixgbe_tx_desc_done(txq, txq->tx_next_dd))
                return 0;
 
        /*
@@ -3412,7 +3410,6 @@ int
 ixgbe_dev_tx_descriptor_status(void *tx_queue, uint16_t offset)
 {
        struct ci_tx_queue *txq = tx_queue;
-       volatile uint32_t *status;
        uint32_t desc;
 
        if (unlikely(offset >= txq->nb_tx_desc))
@@ -3428,8 +3425,7 @@ ixgbe_dev_tx_descriptor_status(void *tx_queue, uint16_t 
offset)
                        desc -= txq->nb_tx_desc;
        }
 
-       status = &txq->ixgbe_tx_ring[desc].wb.status;
-       if (*status & rte_cpu_to_le_32(IXGBE_ADVTXD_STAT_DD))
+       if (ixgbe_tx_desc_done(txq, desc))
                return RTE_ETH_TX_DESC_DONE;
 
        return RTE_ETH_TX_DESC_FULL;
diff --git a/drivers/net/intel/ixgbe/ixgbe_rxtx.h 
b/drivers/net/intel/ixgbe/ixgbe_rxtx.h
index 6fcc5ee1e6..4887a81c4a 100644
--- a/drivers/net/intel/ixgbe/ixgbe_rxtx.h
+++ b/drivers/net/intel/ixgbe/ixgbe_rxtx.h
@@ -5,6 +5,8 @@
 #ifndef _IXGBE_RXTX_H_
 #define _IXGBE_RXTX_H_
 
+#include "ixgbe_type.h"
+
 #include "../common/tx.h"
 
 /*
@@ -241,4 +243,23 @@ uint64_t ixgbe_get_rx_port_offloads(struct rte_eth_dev 
*dev);
 uint64_t ixgbe_get_tx_queue_offloads(struct rte_eth_dev *dev);
 int ixgbe_get_monitor_addr(void *rx_queue, struct rte_power_monitor_cond *pmc);
 
+/**
+ * Check if the Tx descriptor DD bit is set.
+ *
+ * @param txq
+ *   Pointer to the Tx queue structure.
+ * @param idx
+ *   Index of the Tx descriptor to check.
+ *
+ * @return
+ *   1 if the Tx descriptor is done, 0 otherwise.
+ */
+static inline int
+ixgbe_tx_desc_done(struct ci_tx_queue *txq, uint16_t idx)
+{
+       const uint32_t status = txq->ixgbe_tx_ring[idx].wb.status;
+
+       return !!(status & rte_cpu_to_le_32(IXGBE_ADVTXD_STAT_DD));
+}
+
 #endif /* _IXGBE_RXTX_H_ */
diff --git a/drivers/net/intel/ixgbe/ixgbe_rxtx_vec_common.c 
b/drivers/net/intel/ixgbe/ixgbe_rxtx_vec_common.c
index cf6d3e4914..707dc7f5f9 100644
--- a/drivers/net/intel/ixgbe/ixgbe_rxtx_vec_common.c
+++ b/drivers/net/intel/ixgbe/ixgbe_rxtx_vec_common.c
@@ -215,7 +215,6 @@ ixgbe_recycle_tx_mbufs_reuse_vec(void *tx_queue,
        struct ci_tx_entry *txep;
        struct rte_mbuf **rxep;
        int i, n;
-       uint32_t status;
        uint16_t nb_recycle_mbufs;
        uint16_t avail = 0;
        uint16_t mbuf_ring_size = recycle_rxq_info->mbuf_ring_size;
@@ -232,8 +231,7 @@ ixgbe_recycle_tx_mbufs_reuse_vec(void *tx_queue,
                return 0;
 
        /* check DD bits on threshold descriptor */
-       status = txq->ixgbe_tx_ring[txq->tx_next_dd].wb.status;
-       if (!(status & IXGBE_ADVTXD_STAT_DD))
+       if (!ixgbe_tx_desc_done(txq, txq->tx_next_dd))
                return 0;
 
        n = txq->tx_rs_thresh;
diff --git a/drivers/net/intel/ixgbe/ixgbe_rxtx_vec_common.h 
b/drivers/net/intel/ixgbe/ixgbe_rxtx_vec_common.h
index 4678a5dfd9..e5b16af694 100644
--- a/drivers/net/intel/ixgbe/ixgbe_rxtx_vec_common.h
+++ b/drivers/net/intel/ixgbe/ixgbe_rxtx_vec_common.h
@@ -29,15 +29,13 @@ static __rte_always_inline int
 ixgbe_tx_free_bufs_vec(struct ci_tx_queue *txq)
 {
        struct ci_tx_entry_vec *txep;
-       uint32_t status;
        uint32_t n;
        uint32_t i;
        int nb_free = 0;
        struct rte_mbuf *m, *free[RTE_IXGBE_TX_MAX_FREE_BUF_SZ];
 
        /* check DD bit on threshold descriptor */
-       status = txq->ixgbe_tx_ring[txq->tx_next_dd].wb.status;
-       if (!(status & IXGBE_ADVTXD_STAT_DD))
+       if (!ixgbe_tx_desc_done(txq, txq->tx_next_dd))
                return 0;
 
        n = txq->tx_rs_thresh;
-- 
2.47.1

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