[RFC 5/5] fib: add tbl8 pool stats API

[Maxime Leroy]

Add rte_fib_tbl8_pool_get_stats() to retrieve the number of used and
total tbl8 groups from a pool handle directly, without going through
a FIB instance.

Signed-off-by: Maxime Leroy <maxime at leroys.fr>
---
 lib/fib/fib_tbl8_pool.c     | 17 +++++++++++++++++
 lib/fib/rte_fib_tbl8_pool.h | 19 +++++++++++++++++++
 2 files changed, 36 insertions(+)

diff --git a/lib/fib/fib_tbl8_pool.c b/lib/fib/fib_tbl8_pool.c
index 10e0c57ba7..d47fccd987 100644
--- a/lib/fib/fib_tbl8_pool.c
+++ b/lib/fib/fib_tbl8_pool.c
@@ -318,3 +318,20 @@ rte_fib_tbl8_pool_rcu_qsbr_add(struct rte_fib_tbl8_pool *pool,
 	pool->v = cfg->v;
 	return 0;
 }
+
+RTE_EXPORT_EXPERIMENTAL_SYMBOL(rte_fib_tbl8_pool_get_stats, 26.07)
+int
+rte_fib_tbl8_pool_get_stats(struct rte_fib_tbl8_pool *pool,
+			    uint32_t *used, uint32_t *total, uint32_t *max)
+{
+	if (pool == NULL)
+		return -EINVAL;
+
+	if (used != NULL)
+		*used = pool->cur_tbl8s;
+	if (total != NULL)
+		*total = pool->num_tbl8s;
+	if (max != NULL)
+		*max = pool->max_tbl8s;
+	return 0;
+}
diff --git a/lib/fib/rte_fib_tbl8_pool.h b/lib/fib/rte_fib_tbl8_pool.h
index d37ddedff3..49a2589a5b 100644
--- a/lib/fib/rte_fib_tbl8_pool.h
+++ b/lib/fib/rte_fib_tbl8_pool.h
@@ -123,6 +123,25 @@ int
 rte_fib_tbl8_pool_resize(struct rte_fib_tbl8_pool *pool,
 			 uint32_t new_num_tbl8);
 
+/**
+ * Retrieve tbl8 pool statistics.
+ *
+ * @param pool
+ *   Pool handle
+ * @param used
+ *   Number of tbl8 groups currently in use (can be NULL)
+ * @param total
+ *   Total number of tbl8 groups (current capacity, can be NULL)
+ * @param max
+ *   Maximum number of tbl8 groups (0 = fixed, can be NULL)
+ * @return
+ *   0 on success, -EINVAL if pool is NULL
+ */
+__rte_experimental
+int
+rte_fib_tbl8_pool_get_stats(struct rte_fib_tbl8_pool *pool,
+			    uint32_t *used, uint32_t *total, uint32_t *max);
+
 #ifdef __cplusplus
 }
 #endif
-- 
2.43.0