[PATCH v2] dmadev: get DMA device using device ID

[Amit Prakash Shukla <amitprakashs@marvell.com>]

DMA library has a function to get DMA device based on device name but
there is no function to get DMA device using device id.

Added a function that lookup for the dma device using device id and
returns the pointer to the same.

Signed-off-by: Amit Prakash Shukla <amitprakashs@marvell.com>
---
v2:
- Dropped patch with dma event op structure.
- Resolved review suggestions.

 lib/dmadev/rte_dmadev.c     | 12 ++++++++++++
 lib/dmadev/rte_dmadev_pmd.h | 15 +++++++++++++++
 lib/dmadev/version.map      |  1 +
 3 files changed, 28 insertions(+)

diff --git a/lib/dmadev/rte_dmadev.c b/lib/dmadev/rte_dmadev.c
index bf7d5ec519..d82464f0ca 100644
--- a/lib/dmadev/rte_dmadev.c
+++ b/lib/dmadev/rte_dmadev.c
@@ -121,6 +121,18 @@ dma_find_by_name(const char *name)
 	return NULL;
 }
 
+struct rte_dma_dev*
+rte_dma_pmd_dev_get(uint8_t dev_id)
+{
+	if (rte_dma_devices == NULL || dev_id >= dma_devices_max)
+		return NULL;
+
+	if (rte_dma_devices[dev_id].state == RTE_DMA_DEV_UNUSED)
+		return NULL;
+
+	return &rte_dma_devices[dev_id];
+}
+
 static void dma_fp_object_dummy(struct rte_dma_fp_object *obj);
 
 static int
diff --git a/lib/dmadev/rte_dmadev_pmd.h b/lib/dmadev/rte_dmadev_pmd.h
index c61cedfb23..b1f50c3931 100644
--- a/lib/dmadev/rte_dmadev_pmd.h
+++ b/lib/dmadev/rte_dmadev_pmd.h
@@ -167,6 +167,21 @@ struct rte_dma_dev *rte_dma_pmd_allocate(const char *name, int numa_node,
 __rte_internal
 int rte_dma_pmd_release(const char *name);
 
+/**
+ * @internal
+ *
+ * Get the rte_dma_dev structure device pointer for the device.
+ *
+ * @param dev_id
+ *   Device ID value to select the device structure.
+ *
+ * @return
+ *   - rte_dma_dev structure pointer for the given device ID on success, NULL
+ *   otherwise
+ */
+__rte_internal
+struct rte_dma_dev *rte_dma_pmd_dev_get(uint8_t dev_id);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/lib/dmadev/version.map b/lib/dmadev/version.map
index 7031d6b335..22aaa73419 100644
--- a/lib/dmadev/version.map
+++ b/lib/dmadev/version.map
@@ -25,6 +25,7 @@ INTERNAL {
 
 	rte_dma_fp_objs;
 	rte_dma_pmd_allocate;
+	rte_dma_pmd_dev_get;
 	rte_dma_pmd_release;
 
 	local: *;
-- 
2.25.1