[dpdk-dev] [PATCH 1/4] lpm: allocation of an existing object should fail

[Olivier Matz]

Change the API of rte_lpm*_create() functions to return NULL and set
rte_errno to EEXIST when the object name already exists.

These functions were returning a pointer to the existing object in that
case, but it is a problem as the caller did not know if the object had
to be freed or not.

Doing this change also makes the lpm API more consistent with the other
APIs (mempool, rings, ...).

Signed-off-by: Olivier Matz <olivier.matz at 6wind.com>
---
 app/test/test_lpm6.c      |  2 +-
 lib/librte_lpm/rte_lpm.c  | 10 ++++++++--
 lib/librte_lpm/rte_lpm6.c |  5 ++++-
 3 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/app/test/test_lpm6.c b/app/test/test_lpm6.c
index 1f88d7a..b464342 100644
--- a/app/test/test_lpm6.c
+++ b/app/test/test_lpm6.c
@@ -222,7 +222,7 @@ test1(void)
 
 	/* rte_lpm6_create: lpm name == LPM2 */
 	lpm3 = rte_lpm6_create("LPM1", SOCKET_ID_ANY, &config);
-	TEST_LPM_ASSERT(lpm3 == lpm1);
+	TEST_LPM_ASSERT(lpm3 == NULL);
 
 	rte_lpm6_free(lpm1);
 	rte_lpm6_free(lpm2);
diff --git a/lib/librte_lpm/rte_lpm.c b/lib/librte_lpm/rte_lpm.c
index af5811c..62e74bb 100644
--- a/lib/librte_lpm/rte_lpm.c
+++ b/lib/librte_lpm/rte_lpm.c
@@ -209,8 +209,11 @@ rte_lpm_create_v20(const char *name, int socket_id, int max_rules,
 		if (strncmp(name, lpm->name, RTE_LPM_NAMESIZE) == 0)
 			break;
 	}
-	if (te != NULL)
+	if (te != NULL) {
+		lpm = NULL;
+		rte_errno = EEXIST;
 		goto exit;
+	}
 
 	/* allocate tailq entry */
 	te = rte_zmalloc("LPM_TAILQ_ENTRY", sizeof(*te), 0);
@@ -280,8 +283,11 @@ rte_lpm_create_v1604(const char *name, int socket_id,
 		if (strncmp(name, lpm->name, RTE_LPM_NAMESIZE) == 0)
 			break;
 	}
-	if (te != NULL)
+	if (te != NULL) {
+		lpm = NULL;
+		rte_errno = EEXIST;
 		goto exit;
+	}
 
 	/* allocate tailq entry */
 	te = rte_zmalloc("LPM_TAILQ_ENTRY", sizeof(*te), 0);
diff --git a/lib/librte_lpm/rte_lpm6.c b/lib/librte_lpm/rte_lpm6.c
index 4c44cd7..9877a30 100644
--- a/lib/librte_lpm/rte_lpm6.c
+++ b/lib/librte_lpm/rte_lpm6.c
@@ -182,8 +182,11 @@ rte_lpm6_create(const char *name, int socket_id,
 		if (strncmp(name, lpm->name, RTE_LPM6_NAMESIZE) == 0)
 			break;
 	}
-	if (te != NULL)
+	if (te != NULL) {
+		lpm = NULL;
+		rte_errno = EEXIST;
 		goto exit;
+	}
 
 	/* allocate tailq entry */
 	te = rte_zmalloc("LPM6_TAILQ_ENTRY", sizeof(*te), 0);
-- 
2.1.4