[dpdk-dev] [PATCH 1/2] mbuf: update default Mempool ops with HW active pool

[Hemant Agrawal <hemant.agrawal@nxp.com>]

With this patch the specific HW mempool are no longer required to be
specified in the config file at compile. A default active hw mempool
can be detected dynamically and published to default mempools ops
config at run time. Only one type of HW mempool can be active default.

Signed-off-by: Hemant Agrawal <hemant.agrawal@nxp.com>
---
 lib/librte_mbuf/rte_mbuf.c | 33 ++++++++++++++++++++++++++++++++-
 lib/librte_mbuf/rte_mbuf.h | 13 +++++++++++++
 2 files changed, 45 insertions(+), 1 deletion(-)

diff --git a/lib/librte_mbuf/rte_mbuf.c b/lib/librte_mbuf/rte_mbuf.c
index 7543662..e074afa 100644
--- a/lib/librte_mbuf/rte_mbuf.c
+++ b/lib/librte_mbuf/rte_mbuf.c
@@ -148,6 +148,37 @@ rte_pktmbuf_init(struct rte_mempool *mp,
 	m->next = NULL;
 }
 
+static const char *active_mbuf_pool_ops_name;
+
+int
+rte_pktmbuf_reg_active_mempool_ops(const char *ops_name)
+{
+	if (active_mbuf_pool_ops_name == NULL) {
+		active_mbuf_pool_ops_name = ops_name;
+		return 0;
+	}
+	RTE_LOG(ERR, MBUF,
+		"%s is already registered as active pktmbuf pool ops\n",
+		active_mbuf_pool_ops_name);
+	return -EACCES;
+}
+
+/* Return mbuf pool ops name */
+static const char *
+rte_pktmbuf_active_mempool_ops(void)
+{
+	const char *default_ops = rte_eal_mbuf_default_mempool_ops();
+
+	/* If mbuf default ops is same as compile time default
+	 * Just to be sure that no one has updated it by other means.
+	 */
+	if ((strcmp(default_ops, RTE_MBUF_DEFAULT_MEMPOOL_OPS) == 0) &&
+		(active_mbuf_pool_ops_name != NULL))
+		return active_mbuf_pool_ops_name;
+	else
+		return default_ops;
+}
+
 /* helper to create a mbuf pool */
 struct rte_mempool *
 rte_pktmbuf_pool_create(const char *name, unsigned n,
@@ -176,7 +207,7 @@ rte_pktmbuf_pool_create(const char *name, unsigned n,
 	if (mp == NULL)
 		return NULL;
 
-	mp_ops_name = rte_eal_mbuf_default_mempool_ops();
+	mp_ops_name = rte_pktmbuf_active_mempool_ops();
 	ret = rte_mempool_set_ops_byname(mp, mp_ops_name, NULL);
 	if (ret != 0) {
 		RTE_LOG(ERR, MBUF, "error setting mempool handler\n");
diff --git a/lib/librte_mbuf/rte_mbuf.h b/lib/librte_mbuf/rte_mbuf.h
index ce8a05d..3140a0b 100644
--- a/lib/librte_mbuf/rte_mbuf.h
+++ b/lib/librte_mbuf/rte_mbuf.h
@@ -1081,6 +1081,19 @@ rte_pktmbuf_pool_create(const char *name, unsigned n,
 	int socket_id);
 
 /**
+ * Register the active HW pkt mbuf pool
+ *
+ * Register the active pktmbuf HW pool to overwrite the default pool
+ *
+ * @param pool ops name
+ * @return
+ *   - 0: Success
+ *   - -EACCES: Active mempool is already registered.
+ */
+int
+rte_pktmbuf_reg_active_mempool_ops(const char *ops_name);
+
+/**
  * Get the data room size of mbufs stored in a pktmbuf_pool
  *
  * The data room size is the amount of data that can be stored in a
-- 
2.7.4