[PATCH v2] lib/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>
Acked-by: Chengwen Feng <fengchengwen@huawei.com>
---
v2:
  - Arranged api in alphabetical order in version.map

 lib/dmadev/rte_dmadev.c     |  9 +++++++++
 lib/dmadev/rte_dmadev_pmd.h | 14 ++++++++++++++
 lib/dmadev/version.map      |  1 +
 3 files changed, 24 insertions(+)

diff --git a/lib/dmadev/rte_dmadev.c b/lib/dmadev/rte_dmadev.c
index 4e5e420c82..83f49e77f2 100644
--- a/lib/dmadev/rte_dmadev.c
+++ b/lib/dmadev/rte_dmadev.c
@@ -397,6 +397,15 @@ rte_dma_is_valid(int16_t dev_id)
 		rte_dma_devices[dev_id].state != RTE_DMA_DEV_UNUSED;
 }
 
+struct rte_dma_dev *
+rte_dma_pmd_get_dev_by_id(const int dev_id)
+{
+	if (!rte_dma_is_valid(dev_id))
+		return NULL;
+
+	return &rte_dma_devices[dev_id];
+}
+
 uint16_t
 rte_dma_count_avail(void)
 {
diff --git a/lib/dmadev/rte_dmadev_pmd.h b/lib/dmadev/rte_dmadev_pmd.h
index c61cedfb23..f68c3ac6aa 100644
--- a/lib/dmadev/rte_dmadev_pmd.h
+++ b/lib/dmadev/rte_dmadev_pmd.h
@@ -167,6 +167,20 @@ 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 id.
+ *
+ * @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_get_dev_by_id(const int dev_id);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/lib/dmadev/version.map b/lib/dmadev/version.map
index 2a3736514c..046dbfa988 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_get_dev_by_id;
 	rte_dma_pmd_release;
 
 	local: *;
-- 
2.17.1