[dpdk-dev] [PATCH v5 1/9] rawdev: allow devices to skip extra memory allocation

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

Some device drivers want to allocate their own private memory, and should
be allowed to do so. Therefore skip memory allocation and associated error
checks if zero-length private memory is requested.

While adjusting the code for new indent level, fix incorrect error
message.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
Acked-by: Shreyansh Jain <shreyansh.jain@nxp.com>
Acked-by: Hemant Agrawal <hemant.agrawal@nxp.com>

---
V5: Added additional info to doxygen for allocate API
---
 lib/librte_rawdev/rte_rawdev.c     | 11 ++++++-----
 lib/librte_rawdev/rte_rawdev_pmd.h |  4 +++-
 2 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/lib/librte_rawdev/rte_rawdev.c b/lib/librte_rawdev/rte_rawdev.c
index 15de2d413..b6f1e1c77 100644
--- a/lib/librte_rawdev/rte_rawdev.c
+++ b/lib/librte_rawdev/rte_rawdev.c
@@ -496,16 +496,17 @@ rte_rawdev_pmd_allocate(const char *name, size_t dev_priv_size, int socket_id)
 
 	rawdev = &rte_rawdevs[dev_id];
 
-	rawdev->dev_private = rte_zmalloc_socket("rawdev private",
+	if (dev_priv_size > 0) {
+		rawdev->dev_private = rte_zmalloc_socket("rawdev private",
 				     dev_priv_size,
 				     RTE_CACHE_LINE_SIZE,
 				     socket_id);
-	if (!rawdev->dev_private) {
-		RTE_RDEV_ERR("Unable to allocate memory to Skeleton dev");
-		return NULL;
+		if (!rawdev->dev_private) {
+			RTE_RDEV_ERR("Unable to allocate memory for rawdev");
+			return NULL;
+		}
 	}
 
-
 	rawdev->dev_id = dev_id;
 	rawdev->socket_id = socket_id;
 	rawdev->started = 0;
diff --git a/lib/librte_rawdev/rte_rawdev_pmd.h b/lib/librte_rawdev/rte_rawdev_pmd.h
index aa6af4a37..cb3555ab5 100644
--- a/lib/librte_rawdev/rte_rawdev_pmd.h
+++ b/lib/librte_rawdev/rte_rawdev_pmd.h
@@ -568,7 +568,9 @@ struct rte_rawdev_ops {
  * @param name
  *   Unique identifier name for each device
  * @param dev_private_size
- *   Private data allocated within rte_rawdev object.
+ *   Size of private data memory allocated within rte_rawdev object.
+ *   Set to 0 to disable internal memory allocation and allow for
+ *   self-allocation.
  * @param socket_id
  *   Socket to allocate resources on.
  * @return
-- 
2.21.0