hash: check flags on creation for future proofing

All API's should check that they support the flag values
passed. If an application passes an invalid flag it could
cause problems in later ABI.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
Acked-by: Yipeng Wang <yipeng1.wang@intel.com>

diff --git a/lib/librte_hash/rte_cuckoo_hash.c b/lib/librte_hash/rte_cuckoo_hash.c
index 90cb99b..5f701d5 100644 (file)
--- a/lib/librte_hash/rte_cuckoo_hash.c
+++ b/lib/librte_hash/rte_cuckoo_hash.c
@@ -32,6 +32,14 @@
 #include "rte_hash.h"
 #include "rte_cuckoo_hash.h"
 
+/* Mask of all flags supported by this version */
+#define RTE_HASH_EXTRA_FLAGS_MASK (RTE_HASH_EXTRA_FLAGS_TRANS_MEM_SUPPORT | \
+                                  RTE_HASH_EXTRA_FLAGS_MULTI_WRITER_ADD | \
+                                  RTE_HASH_EXTRA_FLAGS_RW_CONCURRENCY | \
+                                  RTE_HASH_EXTRA_FLAGS_EXT_TABLE |     \
+                                  RTE_HASH_EXTRA_FLAGS_NO_FREE_ON_DEL | \
+                                  RTE_HASH_EXTRA_FLAGS_RW_CONCURRENCY_LF)
+
 #define FOR_EACH_BUCKET(CURRENT_BKT, START_BUCKET)                            \
        for (CURRENT_BKT = START_BUCKET;                                      \
                CURRENT_BKT != NULL;                                          \
@@ -164,6 +172,12 @@ rte_hash_create(const struct rte_hash_parameters *params)
                return NULL;
        }
 
+       if (params->extra_flag & ~RTE_HASH_EXTRA_FLAGS_MASK) {
+               rte_errno = EINVAL;
+               RTE_LOG(ERR, HASH, "rte_hash_create: unsupported extra flags\n");
+               return NULL;
+       }
+
        /* Validate correct usage of extra options */
        if ((params->extra_flag & RTE_HASH_EXTRA_FLAGS_RW_CONCURRENCY) &&
            (params->extra_flag & RTE_HASH_EXTRA_FLAGS_RW_CONCURRENCY_LF)) {