[dpdk-dev] [PATCH 1/4] mempool: get the external mempool capability

[Santosh Shukla]

Allow external mempool to advertise its capability.
A handler been introduced called rte_mempool_ops_get_hw_cap.
- Upon ->get_hw_cap call, mempool driver will advertise
capability by returning flag.
- Common layer updates flag value in 'mp->flags'.

Signed-off-by: Santosh Shukla <santosh.shu...@caviumnetworks.com>
Signed-off-by: Jerin Jacob <jerin.ja...@caviumnetworks.com>
---
 lib/librte_mempool/rte_mempool.c           |  5 +++++
 lib/librte_mempool/rte_mempool.h           | 20 ++++++++++++++++++++
 lib/librte_mempool/rte_mempool_ops.c       | 14 ++++++++++++++
 lib/librte_mempool/rte_mempool_version.map |  7 +++++++
 4 files changed, 46 insertions(+)

diff --git a/lib/librte_mempool/rte_mempool.c b/lib/librte_mempool/rte_mempool.c
index f65310f60..045baef45 100644
--- a/lib/librte_mempool/rte_mempool.c
+++ b/lib/librte_mempool/rte_mempool.c
@@ -527,6 +527,11 @@ rte_mempool_populate_default(struct rte_mempool *mp)
        if (mp->nb_mem_chunks != 0)
                return -EEXIST;
 
+       /* Get external mempool capability */
+       ret = rte_mempool_ops_get_hw_cap(mp);
+       if (ret != -ENOENT)
+               mp->flags |= ret;
+
        if (rte_xen_dom0_supported()) {
                pg_sz = RTE_PGSIZE_2M;
                pg_shift = rte_bsf32(pg_sz);
diff --git a/lib/librte_mempool/rte_mempool.h b/lib/librte_mempool/rte_mempool.h
index a65f1a79d..c3cdc77e4 100644
--- a/lib/librte_mempool/rte_mempool.h
+++ b/lib/librte_mempool/rte_mempool.h
@@ -390,6 +390,12 @@ typedef int (*rte_mempool_dequeue_t)(struct rte_mempool 
*mp,
  */
 typedef unsigned (*rte_mempool_get_count)(const struct rte_mempool *mp);
 
+/**
+ * Get the mempool hw capability.
+ */
+typedef int (*rte_mempool_get_hw_cap_t)(struct rte_mempool *mp);
+
+
 /** Structure defining mempool operations structure */
 struct rte_mempool_ops {
        char name[RTE_MEMPOOL_OPS_NAMESIZE]; /**< Name of mempool ops struct. */
@@ -398,6 +404,7 @@ 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. */
+       rte_mempool_get_hw_cap_t get_hw_cap; /**< Get hw capability */
 } __rte_cache_aligned;
 
 #define RTE_MEMPOOL_MAX_OPS_IDX 16  /**< Max registered ops structs */
@@ -509,6 +516,19 @@ 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_hw_cap callback.
+ *
+ * @param mp
+ *   Pointer to the memory pool.
+ * @return
+ *   - On success; Valid capability flag.
+ *   - On failure; -ENOENT error code i.e. implementation not supported.
+ */
+int
+rte_mempool_ops_get_hw_cap(struct rte_mempool *mp);
+
 /**
  * @internal wrapper for mempool_ops free callback.
  *
diff --git a/lib/librte_mempool/rte_mempool_ops.c 
b/lib/librte_mempool/rte_mempool_ops.c
index 5f24de250..3a09f5d32 100644
--- a/lib/librte_mempool/rte_mempool_ops.c
+++ b/lib/librte_mempool/rte_mempool_ops.c
@@ -85,6 +85,7 @@ 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_hw_cap = h->get_hw_cap;
 
        rte_spinlock_unlock(&rte_mempool_ops_table.sl);
 
@@ -123,6 +124,19 @@ rte_mempool_ops_get_count(const struct rte_mempool *mp)
        return ops->get_count(mp);
 }
 
+/* wrapper to get external mempool capability. */
+int
+rte_mempool_ops_get_hw_cap(struct rte_mempool *mp)
+{
+       struct rte_mempool_ops *ops;
+
+       ops = rte_mempool_get_ops(mp->ops_index);
+       if (ops->get_hw_cap)
+               return ops->get_hw_cap(mp);
+
+       return -ENOENT;
+}
+
 /* sets mempool ops previously registered by rte_mempool_register_ops. */
 int
 rte_mempool_set_ops_byname(struct rte_mempool *mp, const char *name,
diff --git a/lib/librte_mempool/rte_mempool_version.map 
b/lib/librte_mempool/rte_mempool_version.map
index f9c079447..d92334672 100644
--- a/lib/librte_mempool/rte_mempool_version.map
+++ b/lib/librte_mempool/rte_mempool_version.map
@@ -41,3 +41,10 @@ DPDK_16.07 {
        rte_mempool_set_ops_byname;
 
 } DPDK_2.0;
+
+DPDK_17.08 {
+       global:
+
+       rte_mempool_ops_get_hw_cap;
+
+} DPDK_17.05;
-- 
2.13.0