[dpdk-dev] [PATCH v3 12/13] compressdev: add device capabilities

[Pablo de Lara <pablo.de.lara.guarch@intel.com>]

From: Fiona Trahe <fiona.trahe@intel.com>

Added structure which each PMD will fill out,
providing the capabilities of each driver
(containing mainly which compression services
it supports).

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           | 23 ++++++++++++++
 lib/librte_compressdev/rte_compressdev.h           | 35 ++++++++++++++++++++++
 lib/librte_compressdev/rte_compressdev_version.map |  1 +
 3 files changed, 59 insertions(+)

diff --git a/lib/librte_compressdev/rte_compressdev.c b/lib/librte_compressdev/rte_compressdev.c
index b327f9915..70d5de92c 100644
--- a/lib/librte_compressdev/rte_compressdev.c
+++ b/lib/librte_compressdev/rte_compressdev.c
@@ -56,6 +56,29 @@ static struct rte_compressdev_global compressdev_globals = {
 
 struct rte_compressdev_global *rte_compressdev_globals = &compressdev_globals;
 
+const struct rte_compressdev_capabilities * __rte_experimental
+rte_compressdev_capability_get(uint8_t dev_id,
+			enum rte_comp_algorithm algo)
+{
+	const struct rte_compressdev_capabilities *capability;
+	struct rte_compressdev_info dev_info;
+	int i = 0;
+
+	if (dev_id >= compressdev_globals.nb_devs) {
+		COMPRESSDEV_LOG(ERR, "Invalid dev_id=%d", dev_id);
+		return NULL;
+	}
+	rte_compressdev_info_get(dev_id, &dev_info);
+
+	while ((capability = &dev_info.capabilities[i++])->algo !=
+			RTE_COMP_ALGO_UNSPECIFIED){
+		if (capability->algo == algo)
+			return capability;
+	}
+
+	return NULL;
+}
+
 const char * __rte_experimental
 rte_compressdev_get_feature_name(uint64_t flag)
 {
diff --git a/lib/librte_compressdev/rte_compressdev.h b/lib/librte_compressdev/rte_compressdev.h
index f8aab528c..e9cb212ec 100644
--- a/lib/librte_compressdev/rte_compressdev.h
+++ b/lib/librte_compressdev/rte_compressdev.h
@@ -34,6 +34,39 @@ extern int compressdev_logtype;
 #define RTE_COMPRESSDEV_NAME_MAX_LEN	(64)
 /**< Max length of name of comp PMD */
 
+/**
+ * Parameter log base 2 range description.
+ * Final value will be 2^value.
+ */
+struct rte_param_log2_range {
+	uint8_t min;	/**< Minimum log2 value */
+	uint8_t max;	/**< Maximum log2 value */
+	uint8_t increment;
+	/**< If a range of sizes are supported,
+	 * this parameter is used to indicate
+	 * increments in base 2 log byte value
+	 * that are supported between the minimum and maximum
+	 */
+};
+
+/** Structure used to capture a capability of a comp device */
+struct rte_compressdev_capabilities {
+	enum rte_comp_algorithm algo;
+	/* Compression algorithm */
+	uint64_t comp_feature_flags;
+	/**< Bitmask of flags for compression service features */
+	struct rte_param_log2_range window_size;
+	/**< Window size range in base two log byte values */
+};
+
+/** Macro used at end of comp PMD list */
+#define RTE_COMP_END_OF_CAPABILITIES_LIST() \
+	{ RTE_COMP_ALGO_UNSPECIFIED }
+
+const struct rte_compressdev_capabilities * __rte_experimental
+rte_compressdev_capability_get(uint8_t dev_id,
+			enum rte_comp_algorithm algo);
+
 /**
  * compression device supported feature flags
  *
@@ -116,6 +149,8 @@ struct rte_compressdev_info {
 	const char *driver_name;		/**< Driver name. */
 	uint8_t driver_id;			/**< Driver identifier */
 	uint64_t feature_flags;			/**< Feature flags */
+	const struct rte_compressdev_capabilities *capabilities;
+	/**< Array of devices supported capabilities */
 	uint16_t max_nb_queue_pairs;
 	/**< Maximum number of queues pairs supported by device.
 	 * (If 0, there is no limit in maximum number of queue pairs)
diff --git a/lib/librte_compressdev/rte_compressdev_version.map b/lib/librte_compressdev/rte_compressdev_version.map
index 7bdc58a38..dec73fcff 100644
--- a/lib/librte_compressdev/rte_compressdev_version.map
+++ b/lib/librte_compressdev/rte_compressdev_version.map
@@ -5,6 +5,7 @@ EXPERIMENTAL {
 	rte_compressdev_allocate_driver;
 	rte_compressdev_callback_register;
 	rte_compressdev_callback_unregister;
+	rte_compressdev_capability_get;
 	rte_compressdev_close;
 	rte_compressdev_configure;
 	rte_compressdev_count;
-- 
2.14.3