dmadev: get device structure using ID

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 <[email protected]>
Acked-by: Chengwen Feng <[email protected]>
Acked-by: Anoob Joseph <[email protected]>

Author: amitshukla-mrvl

lib/dmadev/rte_dmadev.c

@@ -398,6 +398,15 @@ 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(int16_t dev_id)
+{
+	if (!rte_dma_is_valid(dev_id))
+		return NULL;
+
+	return &rte_dma_devices[dev_id];
+}
+
 uint16_t
 rte_dma_count_avail(void)
 {

lib/dmadev/rte_dmadev_pmd.h

@@ -167,6 +167,19 @@ 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
+ *   DMA device index in dmadev library.
+ *
+ * @return
+ *   rte_dma_dev structure pointer on success, NULL otherwise.
+ */
+__rte_internal
+struct rte_dma_dev *rte_dma_pmd_get_dev_by_id(int16_t dev_id);
+
 #ifdef __cplusplus
 }
 #endif

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: *;