[dpdk-dev] [PATCH v3 1/8] dmadev: add channel status check for testing use

[Bruce Richardson <bruce.richardson@intel.com>]

Add in a function to check if a device or vchan has completed all jobs
assigned to it, without gathering in the results. This is primarily for
use in testing, to allow the hardware to be in a known-state prior to
gathering completions.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
---
 lib/dmadev/rte_dmadev.c      | 16 ++++++++++++++++
 lib/dmadev/rte_dmadev.h      | 33 +++++++++++++++++++++++++++++++++
 lib/dmadev/rte_dmadev_core.h |  6 ++++++
 lib/dmadev/version.map       |  1 +
 4 files changed, 56 insertions(+)

diff --git a/lib/dmadev/rte_dmadev.c b/lib/dmadev/rte_dmadev.c
index ee8db9aaca..ab45928efb 100644
--- a/lib/dmadev/rte_dmadev.c
+++ b/lib/dmadev/rte_dmadev.c
@@ -605,3 +605,19 @@ rte_dmadev_dump(uint16_t dev_id, FILE *f)
 
 	return 0;
 }
+
+int
+rte_dmadev_vchan_status(uint16_t dev_id, uint16_t vchan, enum rte_dmadev_vchan_status *status)
+{
+	struct rte_dmadev *dev = &rte_dmadevices[dev_id];
+
+	RTE_DMADEV_VALID_DEV_ID_OR_ERR_RET(dev_id, -EINVAL);
+	if (vchan >= dev->data->dev_conf.nb_vchans) {
+		RTE_DMADEV_LOG(ERR,
+			"Device %u vchan %u out of range\n", dev_id, vchan);
+		return -EINVAL;
+	}
+
+	RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->vchan_status, -ENOTSUP);
+	return (*dev->dev_ops->vchan_status)(dev, vchan, status);
+}
diff --git a/lib/dmadev/rte_dmadev.h b/lib/dmadev/rte_dmadev.h
index 3cb95fe31a..39d73872c8 100644
--- a/lib/dmadev/rte_dmadev.h
+++ b/lib/dmadev/rte_dmadev.h
@@ -640,6 +640,39 @@ __rte_experimental
 int
 rte_dmadev_stats_reset(uint16_t dev_id, uint16_t vchan);
 
+/**
+ * device vchannel status
+ *
+ * Enum with the options for the channel status, either idle, active or halted due to error
+ */
+enum rte_dmadev_vchan_status {
+	RTE_DMA_VCHAN_IDLE,          /**< not processing, awaiting ops */
+	RTE_DMA_VCHAN_ACTIVE,        /**< currently processing jobs */
+	RTE_DMA_VCHAN_HALTED_ERROR,  /**< not processing due to error, cannot accept new ops */
+};
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice.
+ *
+ * Determine if all jobs have completed on a device channel.
+ * This function is primarily designed for testing use, as it allows a process to check if
+ * all jobs are completed, without actually gathering completions from those jobs.
+ *
+ * @param dev_id
+ *   The identifier of the device.
+ * @param vchan
+ *   The identifier of virtual DMA channel.
+ * @param[out] status
+ *   The vchan status
+ * @return
+ *   0 - call completed successfully
+ *   < 0 - error code indicating there was a problem calling the API
+ */
+__rte_experimental
+int
+rte_dmadev_vchan_status(uint16_t dev_id, uint16_t vchan, enum rte_dmadev_vchan_status *status);
+
 /**
  * @warning
  * @b EXPERIMENTAL: this API may change without prior notice.
diff --git a/lib/dmadev/rte_dmadev_core.h b/lib/dmadev/rte_dmadev_core.h
index 32618b020c..3c9d698044 100644
--- a/lib/dmadev/rte_dmadev_core.h
+++ b/lib/dmadev/rte_dmadev_core.h
@@ -55,6 +55,10 @@ typedef int (*rte_dmadev_stats_reset_t)(struct rte_dmadev *dev, uint16_t vchan);
 typedef int (*rte_dmadev_dump_t)(const struct rte_dmadev *dev, FILE *f);
 /**< @internal Used to dump internal information. */
 
+typedef int (*rte_dmadev_vchan_status_t)(const struct rte_dmadev *dev, uint16_t vchan,
+		enum rte_dmadev_vchan_status *status);
+/**< @internal Used to check if a virtual channel has finished all jobs. */
+
 typedef int (*rte_dmadev_copy_t)(struct rte_dmadev *dev, uint16_t vchan,
 				 rte_iova_t src, rte_iova_t dst,
 				 uint32_t length, uint64_t flags);
@@ -110,6 +114,8 @@ struct rte_dmadev_ops {
 	rte_dmadev_stats_get_t      stats_get;
 	rte_dmadev_stats_reset_t    stats_reset;
 
+	rte_dmadev_vchan_status_t   vchan_status;
+
 	rte_dmadev_dump_t           dev_dump;
 };
 
diff --git a/lib/dmadev/version.map b/lib/dmadev/version.map
index 80be592713..10eeb0f7a3 100644
--- a/lib/dmadev/version.map
+++ b/lib/dmadev/version.map
@@ -19,6 +19,7 @@ EXPERIMENTAL {
 	rte_dmadev_stop;
 	rte_dmadev_submit;
 	rte_dmadev_vchan_setup;
+	rte_dmadev_vchan_status;
 
 	local: *;
 };
-- 
2.30.2