mempool: introduce a function to free a pool

Introduce rte_mempool_free() that:

- unlink the mempool from the global list if it is found
- free all the memory chunks using their free callbacks
- free the internal ring
- free the memzone containing the mempool

Currently this function is only used in error cases when
creating a new mempool, but it will be made public later
in the patch series.

Signed-off-by: Olivier Matz <olivier.matz@6wind.com>

diff --git a/lib/librte_mempool/rte_mempool.c b/lib/librte_mempool/rte_mempool.c
index 891458a..4aff53b 100644 (file)
--- a/lib/librte_mempool/rte_mempool.c
+++ b/lib/librte_mempool/rte_mempool.c
@@ -622,6 +622,35 @@ rte_mempool_populate_default(struct rte_mempool *mp)
        return ret;
 }
 
+/* free a mempool */
+static void
+rte_mempool_free(struct rte_mempool *mp)
+{
+       struct rte_mempool_list *mempool_list = NULL;
+       struct rte_tailq_entry *te;
+
+       if (mp == NULL)
+               return;
+
+       mempool_list = RTE_TAILQ_CAST(rte_mempool_tailq.head, rte_mempool_list);
+       rte_rwlock_write_lock(RTE_EAL_TAILQ_RWLOCK);
+       /* find out tailq entry */
+       TAILQ_FOREACH(te, mempool_list, next) {
+               if (te->data == (void *)mp)
+                       break;
+       }
+
+       if (te != NULL) {
+               TAILQ_REMOVE(mempool_list, te, next);
+               rte_free(te);
+       }
+       rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK);
+
+       rte_mempool_free_memchunks(mp);
+       rte_ring_free(mp->ring);
+       rte_memzone_free(mp->mz);
+}
+
 /*
  * Create the mempool over already allocated chunk of memory.
  * That external memory buffer can consists of physically disjoint pages.
@@ -781,13 +810,7 @@ rte_mempool_xmem_create(const char *name, unsigned n, unsigned elt_size,
 
 exit_unlock:
        rte_rwlock_write_unlock(RTE_EAL_MEMPOOL_RWLOCK);
-       if (mp != NULL) {
-               rte_mempool_free_memchunks(mp);
-               rte_ring_free(mp->ring);
-       }
-       rte_free(te);
-       if (mz != NULL)
-               rte_memzone_free(mz);
+       rte_mempool_free(mp);
 
        return NULL;
 }