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From: Stephen Hemminger <stephen@networkplumber.org>
To: dev@dpdk.org
Cc: Stephen Hemminger <stephen@networkplumber.org>,
 Yipeng Wang <yipeng1.wang@intel.com>,
 Sameh Gobriel <sameh.gobriel@intel.com>,
 Bruce Richardson <bruce.richardson@intel.com>
Date: Mon, 27 Apr 2020 16:16:23 -0700
Message-Id: <20200427231625.10135-3-stephen@networkplumber.org>
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 <20200427231625.10135-1-stephen@networkplumber.org>
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Subject: [dpdk-dev] [PATCH v3 2/4] hash: check flags on creation
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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>
---
 lib/librte_hash/rte_cuckoo_hash.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/lib/librte_hash/rte_cuckoo_hash.c b/lib/librte_hash/rte_cuckoo_hash.c
index 38767a8a164f..d54bbb47edcb 100644
--- 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)) {
-- 
2.20.1