[dpdk-dev] [PATCH v6 02/13] dma/skeleton: add channel status function

[Bruce Richardson]

In order to avoid timing errors with the unit tests, we need to ensure
we have the vchan_status function to report when a channel is idle.

Signed-off-by: Bruce Richardson <bruce.richard...@intel.com>
---
 drivers/dma/skeleton/skeleton_dmadev.c | 18 +++++++++++++++++-
 drivers/dma/skeleton/skeleton_dmadev.h |  2 +-
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/skeleton/skeleton_dmadev.c 
b/drivers/dma/skeleton/skeleton_dmadev.c
index 876878bb78..ada9a3be68 100644
--- a/drivers/dma/skeleton/skeleton_dmadev.c
+++ b/drivers/dma/skeleton/skeleton_dmadev.c
@@ -80,7 +80,7 @@ cpucopy_thread(void *param)
 
                hw->zero_req_count = 0;
                rte_memcpy(desc->dst, desc->src, desc->len);
-               hw->completed_count++;
+               __atomic_add_fetch(&hw->completed_count, 1, __ATOMIC_RELEASE);
                (void)rte_ring_enqueue(hw->desc_completed, (void *)desc);
        }
 
@@ -258,6 +258,21 @@ skeldma_vchan_setup(struct rte_dma_dev *dev, uint16_t 
vchan,
        return vchan_setup(hw, conf->nb_desc);
 }
 
+static int
+skeldma_vchan_status(const struct rte_dma_dev *dev,
+               uint16_t vchan, enum rte_dma_vchan_status *status)
+{
+       struct skeldma_hw *hw = dev->dev_private;
+
+       RTE_SET_USED(vchan);
+
+       *status = RTE_DMA_VCHAN_IDLE;
+       if (hw->submitted_count != __atomic_load_n(&hw->completed_count, 
__ATOMIC_ACQUIRE)
+                       || hw->zero_req_count == 0)
+               *status = RTE_DMA_VCHAN_ACTIVE;
+       return 0;
+}
+
 static int
 skeldma_stats_get(const struct rte_dma_dev *dev, uint16_t vchan,
                  struct rte_dma_stats *stats, uint32_t stats_sz)
@@ -425,6 +440,7 @@ static const struct rte_dma_dev_ops skeldma_ops = {
        .dev_close     = skeldma_close,
 
        .vchan_setup   = skeldma_vchan_setup,
+       .vchan_status  = skeldma_vchan_status,
 
        .stats_get     = skeldma_stats_get,
        .stats_reset   = skeldma_stats_reset,
diff --git a/drivers/dma/skeleton/skeleton_dmadev.h 
b/drivers/dma/skeleton/skeleton_dmadev.h
index eaa52364bf..91eb5460fc 100644
--- a/drivers/dma/skeleton/skeleton_dmadev.h
+++ b/drivers/dma/skeleton/skeleton_dmadev.h
@@ -54,7 +54,7 @@ struct skeldma_hw {
 
        /* Cache delimiter for cpucopy thread's operation data */
        char cache2 __rte_cache_aligned;
-       uint32_t zero_req_count;
+       volatile uint32_t zero_req_count;
        uint64_t completed_count;
 };
 
-- 
2.30.2