compressdev: support stateless operations

Added private transform data (priv_xform) in compression
operation, which will contain the private data from each
PMD to support stateless operations.
Also, added functions to create/free this data.

Signed-off-by: Fiona Trahe <fiona.trahe@intel.com>
Signed-off-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
Signed-off-by: Shally Verma <shally.verma@caviumnetworks.com>
Signed-off-by: Ashish Gupta <ashish.gupta@caviumnetworks.com>

lib/librte_compressdev/rte_compressdev.c

@@ -554,6 +554,54 @@ rte_compressdev_info_get(uint8_t dev_id, struct rte_compressdev_info *dev_info)
 	dev_info->driver_name = dev->device->driver->name;
 }
 
+int __rte_experimental
+rte_compressdev_private_xform_create(uint8_t dev_id,
+		const struct rte_comp_xform *xform,
+		void **priv_xform)
+{
+	struct rte_compressdev *dev;
+	int ret;
+
+	dev = rte_compressdev_get_dev(dev_id);
+
+	if (xform == NULL || priv_xform == NULL || dev == NULL)
+		return -EINVAL;
+
+	RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->private_xform_create, -ENOTSUP);
+	ret = (*dev->dev_ops->private_xform_create)(dev, xform, priv_xform);
+	if (ret < 0) {
+		COMPRESSDEV_LOG(ERR,
+			"dev_id %d failed to create private_xform: err=%d",
+			dev_id, ret);
+		return ret;
+	};
+
+	return 0;
+}
+
+int __rte_experimental
+rte_compressdev_private_xform_free(uint8_t dev_id, void *priv_xform)
+{
+	struct rte_compressdev *dev;
+	int ret;
+
+	dev = rte_compressdev_get_dev(dev_id);
+
+	if (dev == NULL || priv_xform == NULL)
+		return -EINVAL;
+
+	RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->private_xform_free, -ENOTSUP);
+	ret = dev->dev_ops->private_xform_free(dev, priv_xform);
+	if (ret < 0) {
+		COMPRESSDEV_LOG(ERR,
+			"dev_id %d failed to free private xform: err=%d",
+			dev_id, ret);
+		return ret;
+	};
+
+	return 0;
+}
+
 const char * __rte_experimental
 rte_compressdev_name_get(uint8_t dev_id)
 {

lib/librte_compressdev/rte_compressdev.h

@@ -89,6 +89,8 @@ struct rte_compressdev_config {
 	/**< Socket on which to allocate resources */
 	uint16_t nb_queue_pairs;
 	/**< Total number of queue pairs to configure on a device */
+	uint16_t max_nb_priv_xforms;
+	/**< Max number of private_xforms which will be created on the device */
 };
 
 /**
@@ -314,6 +316,52 @@ uint16_t __rte_experimental
 rte_compressdev_enqueue_burst(uint8_t dev_id, uint16_t qp_id,
 		struct rte_comp_op **ops, uint16_t nb_ops);
 
+/**
+ * This should alloc a private_xform from the device's mempool and initialise
+ * it. The application should call this API when setting up for stateless
+ * processing on a device. If it returns non-shareable, then the appl cannot
+ * share this handle with multiple in-flight ops and should call this API again
+ * to get a separate handle for every in-flight op.
+ * The handle returned is only valid for use with ops of op_type STATELESS.
+ *
+ * @param dev_id
+ *   Compress device identifier
+ * @param xform
+ *   xform data
+ * @param private_xform
+ *   Pointer to where PMD's private_xform handle should be stored
+ *
+ * @return
+ *  - if successful returns 0
+ *    and valid private_xform handle
+ *  - <0 in error cases
+ *  - Returns -EINVAL if input parameters are invalid.
+ *  - Returns -ENOTSUP if comp device does not support the comp transform.
+ *  - Returns -ENOMEM if the private_xform could not be allocated.
+ */
+int __rte_experimental
+rte_compressdev_private_xform_create(uint8_t dev_id,
+		const struct rte_comp_xform *xform,
+		void **private_xform);
+
+/**
+ * This should clear the private_xform and return it to the device's mempool.
+ *
+ * @param dev_id
+ *   Compress device identifier
+ *
+ * @param private_xform
+ *   PMD's private_xform data
+ *
+ * @return
+ *  - 0 if successful
+ *  - <0 in error cases
+ *  - Returns -EINVAL if input parameters are invalid.
+ *  - Returns -EBUSY if can't free private_xform due to inflight operations
+ */
+int __rte_experimental
+rte_compressdev_private_xform_free(uint8_t dev_id, void *private_xform);
+
 #ifdef __cplusplus
 }
 #endif

lib/librte_compressdev/rte_compressdev_pmd.h

@@ -166,6 +166,41 @@ typedef int (*compressdev_queue_pair_release_t)(struct rte_compressdev *dev,
  */
 typedef uint32_t (*compressdev_queue_pair_count_t)(struct rte_compressdev *dev);
 
+/**
+ * Create driver private_xform data.
+ *
+ * @param dev
+ *   Compressdev device
+ * @param xform
+ *   xform data
+ * @param private_xform
+ *   ptr where handle of pmd's private_xform data should be stored
+ * @return
+ *  - if successful returns 0
+ *    and valid private_xform handle
+ *  - <0 in error cases
+ *  - Returns -EINVAL if input parameters are invalid.
+ *  - Returns -ENOTSUP if comp device does not support the comp transform.
+ *  - Returns -ENOMEM if the private_xform could not be allocated.
+ */
+typedef int (*compressdev_private_xform_create_t)(struct rte_compressdev *dev,
+		const struct rte_comp_xform *xform, void **private_xform);
+
+/**
+ * Free driver private_xform data.
+ *
+ * @param dev
+ *   Compressdev device
+ * @param private_xform
+ *   handle of pmd's private_xform data
+ * @return
+ *  - 0 if successful
+ *  - <0 in error cases
+ *  - Returns -EINVAL if input parameters are invalid.
+ *  - Returns -EBUSY if can't free private_xform due to inflight operations
+ */
+typedef int (*compressdev_private_xform_free_t)(struct rte_compressdev *dev,
+		void *private_xform);
 
 /** comp device operations function pointer table */
 struct rte_compressdev_ops {
@@ -180,6 +215,11 @@ struct rte_compressdev_ops {
 	/**< Set up a device queue pair. */
 	compressdev_queue_pair_release_t queue_pair_release;
 	/**< Release a queue pair. */
+
+	compressdev_private_xform_create_t private_xform_create;
+	/**< Create a comp private_xform and initialise its private data. */
+	compressdev_private_xform_free_t private_xform_free;
+	/**< Free a comp private_xform's data. */
 };
 
 /**

lib/librte_compressdev/rte_compressdev_version.map

@@ -18,6 +18,8 @@ EXPERIMENTAL {
 	rte_compressdev_pmd_get_named_dev;
 	rte_compressdev_pmd_parse_input_args;
 	rte_compressdev_pmd_release_device;
+	rte_compressdev_private_xform_create;
+	rte_compressdev_private_xform_free;
 	rte_compressdev_queue_pair_count;
 	rte_compressdev_queue_pair_setup;
 	rte_compressdev_socket_id;