mempool: get capabilities

Allow the mempool driver to advertise his pool capabilities.
For that pupose, an api(rte_mempool_ops_get_capabilities)
and ->get_capabilities() handler has been introduced.
- Upon ->get_capabilities() call, mempool driver will advertise
his capabilities to mempool flags param.

Signed-off-by: Santosh Shukla <santosh.shukla@caviumnetworks.com>
Signed-off-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
Acked-by: Olivier Matz <olivier.matz@6wind.com>

lib/librte_mempool/rte_mempool.c

@@ -522,12 +522,25 @@ rte_mempool_populate_default(struct rte_mempool *mp)
 	size_t size, total_elt_sz, align, pg_sz, pg_shift;
 	phys_addr_t paddr;
 	unsigned mz_id, n;
+	unsigned int mp_flags;
 	int ret;
 
 	/* mempool must not be populated */
 	if (mp->nb_mem_chunks != 0)
 		return -EEXIST;
 
+	/* Get mempool capabilities */
+	mp_flags = 0;
+	ret = rte_mempool_ops_get_capabilities(mp, &mp_flags);
+	if (ret == -ENOTSUP)
+		RTE_LOG(DEBUG, MEMPOOL, "get_capability not supported for %s\n",
+					mp->name);
+	else if (ret < 0)
+		return ret;
+
+	/* update mempool capabilities */
+	mp->flags |= mp_flags;
+
 	if (rte_xen_dom0_supported()) {
 		pg_sz = RTE_PGSIZE_2M;
 		pg_shift = rte_bsf32(pg_sz);

lib/librte_mempool/rte_mempool.h

@@ -389,6 +389,12 @@ typedef int (*rte_mempool_dequeue_t)(struct rte_mempool *mp,
  */
 typedef unsigned (*rte_mempool_get_count)(const struct rte_mempool *mp);
 
+/**
+ * Get the mempool capabilities.
+ */
+typedef int (*rte_mempool_get_capabilities_t)(const struct rte_mempool *mp,
+		unsigned int *flags);
+
 /** Structure defining mempool operations structure */
 struct rte_mempool_ops {
 	char name[RTE_MEMPOOL_OPS_NAMESIZE]; /**< Name of mempool ops struct. */
@@ -397,6 +403,10 @@ struct rte_mempool_ops {
 	rte_mempool_enqueue_t enqueue;   /**< Enqueue an object. */
 	rte_mempool_dequeue_t dequeue;   /**< Dequeue an object. */
 	rte_mempool_get_count get_count; /**< Get qty of available objs. */
+	/**
+	 * Get the mempool capabilities
+	 */
+	rte_mempool_get_capabilities_t get_capabilities;
 } __rte_cache_aligned;
 
 #define RTE_MEMPOOL_MAX_OPS_IDX 16  /**< Max registered ops structs */
@@ -508,6 +518,23 @@ rte_mempool_ops_enqueue_bulk(struct rte_mempool *mp, void * const *obj_table,
 unsigned
 rte_mempool_ops_get_count(const struct rte_mempool *mp);
 
+/**
+ * @internal wrapper for mempool_ops get_capabilities callback.
+ *
+ * @param mp [in]
+ *   Pointer to the memory pool.
+ * @param flags [out]
+ *   Pointer to the mempool flags.
+ * @return
+ *   - 0: Success; The mempool driver has advertised his pool capabilities in
+ *   flags param.
+ *   - -ENOTSUP - doesn't support get_capabilities ops (valid case).
+ *   - Otherwise, pool create fails.
+ */
+int
+rte_mempool_ops_get_capabilities(const struct rte_mempool *mp,
+					unsigned int *flags);
+
 /**
  * @internal wrapper for mempool_ops free callback.
  *

lib/librte_mempool/rte_mempool_ops.c

@@ -37,6 +37,7 @@
 
 #include <rte_mempool.h>
 #include <rte_errno.h>
+#include <rte_dev.h>
 
 /* indirect jump table to support external memory pools. */
 struct rte_mempool_ops_table rte_mempool_ops_table = {
@@ -85,6 +86,7 @@ rte_mempool_register_ops(const struct rte_mempool_ops *h)
 	ops->enqueue = h->enqueue;
 	ops->dequeue = h->dequeue;
 	ops->get_count = h->get_count;
+	ops->get_capabilities = h->get_capabilities;
 
 	rte_spinlock_unlock(&rte_mempool_ops_table.sl);
 
@@ -123,6 +125,19 @@ rte_mempool_ops_get_count(const struct rte_mempool *mp)
 	return ops->get_count(mp);
 }
 
+/* wrapper to get external mempool capabilities. */
+int
+rte_mempool_ops_get_capabilities(const struct rte_mempool *mp,
+					unsigned int *flags)
+{
+	struct rte_mempool_ops *ops;
+
+	ops = rte_mempool_get_ops(mp->ops_index);
+
+	RTE_FUNC_PTR_OR_ERR_RET(ops->get_capabilities, -ENOTSUP);
+	return ops->get_capabilities(mp, flags);
+}
+
 /* sets mempool ops previously registered by rte_mempool_register_ops. */
 int
 rte_mempool_set_ops_byname(struct rte_mempool *mp, const char *name,

lib/librte_mempool/rte_mempool_version.map

@@ -41,3 +41,10 @@ DPDK_16.07 {
 	rte_mempool_set_ops_byname;
 
 } DPDK_2.0;
+
+DPDK_17.11 {
+	global:
+
+	rte_mempool_ops_get_capabilities;
+
+} DPDK_16.07;